Synthesis failed for python-datalabeling

Hello! Autosynth couldn't regenerate python-datalabeling. :broken_heart:
Here's the output from running synth.py:
loud/datalabeling/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
Loading: 0 packages loaded
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Loading: 0 packages loaded
    currently loading: google/cloud/datalabeling/v1beta1
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.683s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-20 08:03:30,201 autosynth [ERROR] > Synthesis failed
2020-06-20 08:03:30,201 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-20 08:03:30,207 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-20 08:03:30,212 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-20 08:03:30,391 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/18
2020-06-20 08:03:30,391 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 649, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 629, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
g/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
Loading: 0 packages loaded
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded)
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.689s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-21 05:23:36,371 autosynth [ERROR] > Synthesis failed
2020-06-21 05:23:36,371 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-21 05:23:36,377 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-21 05:23:36,383 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-21 05:23:36,576 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/18
2020-06-21 05:23:36,576 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 649, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 629, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
400 synthtool [ERROR] > Failed executing bazel --max_idle_secs=60 build //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
Loading: 0 packages loaded
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.565s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-22 05:23:15,436 autosynth [ERROR] > Synthesis failed
2020-06-22 05:23:15,436 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-22 05:23:15,440 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-22 05:23:15,444 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-22 05:23:15,642 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/18
2020-06-22 05:23:15,642 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 649, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 629, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/data_payloads_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/data_payloads_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/gapic/data_labeling_service_client.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/dataset_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/annotation_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/evaluation_job_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/evaluation_job_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/evaluation_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/dataset_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/human_annotation_config_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/evaluation_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/instruction_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/human_annotation_config_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/operations_pb2_grpc.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/types.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/instruction_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/noxfile.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/data_labeling_service_pb2.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/tests/unit/gapic/v1beta1/test_data_labeling_service_client_v1beta1.py
reformatted /home/kbuilder/.cache/synthtool/python-datalabeling/google/cloud/datalabeling_v1beta1/proto/operations_pb2.py
All done! ✨ 🍰 ✨
31 files reformatted, 5 files left unchanged.
Session blacken was successful.
2020-06-23 09:12:29,628 synthtool [DEBUG] > Wrote metadata to synth.metadata.
2020-06-23 09:12:29,678 autosynth [INFO] > Changed files:
2020-06-23 09:12:29,678 autosynth [INFO] > M .flake8
 M .gitignore
 M .kokoro/publish-docs.sh
 M .kokoro/release.sh
 M MANIFEST.in
 M docs/conf.py
 M google/cloud/datalabeling_v1beta1/gapic/data_labeling_service_client.py
 M google/cloud/datalabeling_v1beta1/gapic/data_labeling_service_client_config.py
 M google/cloud/datalabeling_v1beta1/gapic/enums.py
 M google/cloud/datalabeling_v1beta1/gapic/transports/data_labeling_service_grpc_transport.py
 M google/cloud/datalabeling_v1beta1/proto/annotation_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/annotation_spec_set_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/data_labeling_service_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/data_payloads_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/dataset_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/evaluation_job_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/evaluation_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/human_annotation_config_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/instruction_pb2.py
 M google/cloud/datalabeling_v1beta1/proto/operations_pb2.py
 M noxfile.py
 M synth.metadata
 M tests/unit/gapic/v1beta1/test_data_labeling_service_client_v1beta1.py
?? .kokoro/samples/
?? .kokoro/test-samples.sh
?? docs/multiprocessing.rst
?? scripts/
?? testing/
2020-06-23 09:12:29,679 autosynth [DEBUG] > Running: git log cf41866c6f14f10a07aa1e2a1260fc0a2727d889 -1 --no-decorate --pretty=%s
2020-06-23 09:12:29,683 autosynth [DEBUG] > Running: git log cf41866c6f14f10a07aa1e2a1260fc0a2727d889 -1 --no-decorate --pretty=%b%n%nSource-Author: %an <%ae>%nSource-Date: %ad
2020-06-23 09:12:29,687 autosynth [DEBUG] > Running: git add -A
2020-06-23 09:12:29,696 autosynth [DEBUG] > Running: git commit -m feat: migrate websecurityscanner v1alpha BUILD.bazel python part to use micro-gen

PiperOrigin-RevId: 317812187

Source-Author: Google APIs<EMAIL_ADDRESS>Source-Date: Tue Jun 23 00:06:29 2020 -0700
Source-Repo: googleapis/googleapis
Source-Sha: cf41866c6f14f10a07aa1e2a1260fc0a2727d889
Source-Link: https://github.com/googleapis/googleapis/commit/cf41866c6f14f10a07aa1e2a1260fc0a2727d889
[autosynth-312 4fe690b] feat: migrate websecurityscanner v1alpha BUILD.bazel python part to use micro-gen
 49 files changed, 3444 insertions(+), 2228 deletions(-)
 create mode 100644 .kokoro/samples/lint/common.cfg
 create mode 100644 .kokoro/samples/lint/continuous.cfg
 create mode 100644 .kokoro/samples/lint/periodic.cfg
 create mode 100644 .kokoro/samples/lint/presubmit.cfg
 create mode 100644 .kokoro/samples/python3.6/common.cfg
 create mode 100644 .kokoro/samples/python3.6/continuous.cfg
 create mode 100644 .kokoro/samples/python3.6/periodic.cfg
 create mode 100644 .kokoro/samples/python3.6/presubmit.cfg
 create mode 100644 .kokoro/samples/python3.7/common.cfg
 create mode 100644 .kokoro/samples/python3.7/continuous.cfg
 create mode 100644 .kokoro/samples/python3.7/periodic.cfg
 create mode 100644 .kokoro/samples/python3.7/presubmit.cfg
 create mode 100644 .kokoro/samples/python3.8/common.cfg
 create mode 100644 .kokoro/samples/python3.8/continuous.cfg
 create mode 100644 .kokoro/samples/python3.8/periodic.cfg
 create mode 100644 .kokoro/samples/python3.8/presubmit.cfg
 create mode 100755 .kokoro/test-samples.sh
 create mode 100644 docs/multiprocessing.rst
 create mode 100755 scripts/decrypt-secrets.sh
 create mode 100644 scripts/readme-gen/readme_gen.py
 create mode 100644 scripts/readme-gen/templates/README.tmpl.rst
 create mode 100644 scripts/readme-gen/templates/auth.tmpl.rst
 create mode 100644 scripts/readme-gen/templates/auth_api_key.tmpl.rst
 create mode 100644 scripts/readme-gen/templates/install_deps.tmpl.rst
 create mode 100644 scripts/readme-gen/templates/install_portaudio.tmpl.rst
 create mode 100644 testing/.gitignore
2020-06-23 09:12:29,731 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 4fe690b feat: migrate websecurityscanner v1alpha BUILD.bazel python part to use micro-gen
2020-06-23 09:12:29,740 autosynth [DEBUG] > Running: git checkout autosynth
Switched to branch 'autosynth'
2020-06-23 09:12:29,747 autosynth [DEBUG] > Running: git diff HEAD..autosynth-312 -- . :(exclude)synth.metadata
2020-06-23 09:12:29,751 autosynth [DEBUG] > Running: git diff HEAD..autosynth-312 -- synth.metadata
2020-06-23 09:12:29,755 autosynth [DEBUG] > Running: git diff HEAD..autosynth-313 -- . :(exclude)synth.metadata
2020-06-23 09:12:29,771 autosynth [DEBUG] > Running: git diff HEAD autosynth-313
2020-06-23 09:12:29,788 autosynth [DEBUG] > Running: git apply /tmpfs/tmp/tmpmw5powe_/autosynth-313.patch
2020-06-23 09:12:29,797 autosynth [DEBUG] > Running: git add -A
2020-06-23 09:12:29,806 autosynth [DEBUG] > Running: git commit -m chore(python): fix line breaks in template and use newer black version

* chore(python): fix line breaks in template

* fix: also update black version

Source-Author: Bu Sun Kim<EMAIL_ADDRESS>Source-Date: Tue Jun 23 02:33:35 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: cf2eff09d0f5319a4dc5cdce2b6356d85af4a798
Source-Link: https://github.com/googleapis/synthtool/commit/cf2eff09d0f5319a4dc5cdce2b6356d85af4a798
[autosynth e263331] chore(python): fix line breaks in template and use newer black version
 15 files changed, 136 insertions(+), 123 deletions(-)
2020-06-23 09:12:29,837 autosynth [DEBUG] > Running: git push --force origin autosynth
To https://github.com/googleapis/python-datalabeling.git
 + 3f004e1...e263331 autosynth -> autosynth (forced update)
2020-06-23 09:12:33,490 autosynth [DEBUG] > Running: git log -15 --pretty=%b
2020-06-23 09:12:37,325 autosynth [DEBUG] > Running: git clean -fdx
Removing .nox/
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 649, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 629, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
1,649 synthtool [ERROR] > Failed executing bazel --max_idle_secs=60 build //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.224s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-24 12:11:31,699 autosynth [ERROR] > Synthesis failed
2020-06-24 12:11:31,699 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-24 12:11:31,705 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-24 12:11:31,710 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-24 12:11:31,884 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-24 12:11:31,884 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
ld //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.325s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (20 packages loaded, 14 targets configured)
FAILED: Build did NOT complete successfully (20 packages loaded, 14 targets configured)

2020-06-25 05:58:53,760 synthtool [DEBUG] > Wrote metadata to synth.metadata.
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-25 05:58:53,794 autosynth [ERROR] > Synthesis failed
2020-06-25 05:58:53,795 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-25 05:58:53,799 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-25 05:58:53,803 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-25 05:58:54,007 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-25 05:58:54,007 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Loading: 0 packages loaded
    currently loading: google/cloud/datalabeling/v1beta1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.662s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-25 12:16:01,216 autosynth [ERROR] > Synthesis failed
2020-06-25 12:16:01,216 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-25 12:16:01,221 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-25 12:16:01,224 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-25 12:16:01,411 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-25 12:16:01,411 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
ld //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.968s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-26 07:12:06,503 autosynth [ERROR] > Synthesis failed
2020-06-26 07:12:06,503 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-26 07:12:06,508 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-26 07:12:06,512 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-26 07:12:06,716 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-26 07:12:06,716 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
ing/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
Loading: 0 packages loaded
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 8.636s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (14 packages loaded, 14 targets configured)
FAILED: Build did NOT complete successfully (14 packages loaded, 14 targets configured)

2020-06-26 12:02:36,070 synthtool [DEBUG] > Wrote metadata to synth.metadata.
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-26 12:02:36,132 autosynth [ERROR] > Synthesis failed
2020-06-26 12:02:36,132 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-26 12:02:36,139 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-26 12:02:36,146 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-26 12:02:36,336 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-26 12:02:36,337 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
ing/v1beta1:datalabeling-v1beta1-py:

Loading:
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 7.559s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-27 05:36:53,226 autosynth [ERROR] > Synthesis failed
2020-06-27 05:36:53,226 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-27 05:36:53,231 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-27 05:36:53,236 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-27 05:36:53,431 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-27 05:36:53,432 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
//github.com/protocolbuffers/protobuf/archive/fe1790ca0df67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (22 packages loaded, 22 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 8.578s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-28 05:42:28,035 autosynth [ERROR] > Synthesis failed
2020-06-28 05:42:28,035 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-28 05:42:28,040 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-28 05:42:28,044 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-28 05:42:28,308 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-28 05:42:28,308 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
e2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
Loading: 0 packages loaded
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
INFO: Call stack for the definition of repository 'rules_python' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/com_google_protobuf/protobuf_deps.bzl:58:9
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:42:1
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 8.139s
INFO: 0 processes.

Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-29 05:37:07,749 autosynth [ERROR] > Synthesis failed
2020-06-29 05:37:07,749 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-29 05:37:07,754 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'
2020-06-29 05:37:07,759 autosynth [ERROR] > Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.
2020-06-29 05:37:07,935 autosynth [INFO] > PR already exists: https://github.com/googleapis/python-datalabeling/pull/20
2020-06-29 05:37:07,935 autosynth [DEBUG] > Running: git clean -fdx
Removing __pycache__/
Removing google/__pycache__/
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 657, in <module>
    main()
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 506, in main
    return _inner_main(temp_dir)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 637, in _inner_main
    commit_count = synthesize_loop(x, multiple_prs, change_pusher, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 367, in synthesize_loop
    synthesize_inner_loop(fork, synthesizer)
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 411, in synthesize_inner_loop
    synthesizer, len(toolbox.versions) - 1
  File "/tmpfs/src/github/synthtool/autosynth/synth.py", line 266, in synthesize_version_in_new_branch
    synthesizer.synthesize(synth_log_path, self.environ)
  File "/tmpfs/src/github/synthtool/autosynth/synthesizer.py", line 120, in synthesize
    synth_proc.check_returncode()  # Raise an exception.
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 389, in check_returncode
    self.stderr)
subprocess.CalledProcessError: Command '['/tmpfs/src/github/synthtool/env/bin/python3', '-m', 'synthtool', '--metadata', 'synth.metadata', 'synth.py', '--']' returned non-zero exit status 1.

Google internal developers can see the full log here.

Autosynth is still having trouble generating python-datalabeling. :sob:
Here's the output from running synth.py:
67173702f70d5646b82f48f412b99.zip) = 419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730
DEBUG: Rule 'com_google_protobuf' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "419f654d36998a51de2e0b79a67885ec48f8d803615ce66ec82cd15f54936730"
DEBUG: Call stack for the definition of repository 'com_google_protobuf' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:34:1
Loading: 0 packages loaded
Loading: 0 packages loaded
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/gapic-generator/archive/4cb5d58f258afdb8abc0b99706370b4a59252b22.zip) = 3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb
DEBUG: Rule 'com_google_api_codegen' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "3cb59685c8a4ae3db1dec60b286f22d8d3aa3d3b36bb08bf003b5e088fac83cb"
DEBUG: Call stack for the definition of repository 'com_google_api_codegen' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:62:1
INFO: SHA256 (https://github.com/googleapis/protoc-java-resource-names-plugin/archive/5bd90a1f67c1c128291702cc320d667060f40f95.zip) = c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906
DEBUG: Rule 'com_google_protoc_java_resource_names_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "c3c0661b6c30fce5c63b1d5f473b1c6c4d59e19853ce3b9e8f5a447f953af906"
DEBUG: Call stack for the definition of repository 'com_google_protoc_java_resource_names_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:155:1
Loading: 0 packages loaded
INFO: SHA256 (https://github.com/googleapis/protoc-docs-plugin/archive/b2502d56b5ec2d47e063976da773206af295362d.zip) = 765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338
DEBUG: Rule 'protoc_docs_plugin' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "765ec120bb165ae98c3bae78705d2a127e64016e59738552e909fc8b11d06338"
DEBUG: Call stack for the definition of repository 'protoc_docs_plugin' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:179:1
INFO: SHA256 (https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.20.0/bazel-gazelle-v0.20.0.tar.gz) = d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10
DEBUG: Rule 'bazel_gazelle' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "d8c45ee70ec39a57e7a05e5027c32b1576cc7f16d9dd37135b0eddde45cf1b10"
DEBUG: Call stack for the definition of repository 'bazel_gazelle' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:200:1
INFO: SHA256 (https://github.com/googleapis/gapic-generator-go/archive/v0.13.2.tar.gz) = ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22
DEBUG: Rule 'com_googleapis_gapic_generator_go' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "ab7a2ffd74e6a6dac6da38027d4acadb84d0075c055289e3335d86a46f9f3b22"
DEBUG: Call stack for the definition of repository 'com_googleapis_gapic_generator_go' which is a http_archive (rule definition at /home/kbuilder/.cache/bazel/_bazel_kbuilder/a732f932c2cbeb7e37e1543f189a2a73/external/bazel_tools/tools/build_defs/repo/http.bzl:296:16):
 - <builtin>
 - /home/kbuilder/.cache/synthtool/googleapis/WORKSPACE:209:1
Loading: 0 packages loaded
    currently loading: google/cloud/datalabeling/v1beta1
INFO: Build option --protocopt has changed, discarding analysis cache.
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (1 packages loaded, 0 targets configured)
Analyzing: target //google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py (21 packages loaded, 16 targets configured)
ERROR: While resolving toolchains for target @pypi_black//:black: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
ERROR: Analysis of target '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py' failed; build aborted: invalid registered toolchain '@gapic_generator_python//:pyenv3_toolchain': no such package '@gapic_generator_python//': The repository '@gapic_generator_python' could not be resolved
INFO: Elapsed time: 8.243s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (21 packages loaded, 16 targets configured)
FAILED: Build did NOT complete successfully (21 packages loaded, 16 targets configured)

2020-06-30 05:48:49,655 synthtool [DEBUG] > Wrote metadata to synth.metadata.
Traceback (most recent call last):
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 102, in <module>
    main()
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/tmpfs/src/github/synthtool/env/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/__main__.py", line 94, in main
    spec.loader.exec_module(synth_module)  # type: ignore
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/kbuilder/.cache/synthtool/python-datalabeling/synth.py", line 29, in <module>
    include_protos=True,
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 46, in py_library
    return self._generate_code(service, version, "python", **kwargs)
  File "/tmpfs/src/github/synthtool/synthtool/gcp/gapic_bazel.py", line 180, in _generate_code
    shell.run(bazel_run_args)
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 39, in run
    raise exc
  File "/tmpfs/src/github/synthtool/synthtool/shell.py", line 33, in run
    encoding="utf-8",
  File "/home/kbuilder/.pyenv/versions/3.6.9/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['bazel', '--max_idle_secs=60', 'build', '//google/cloud/datalabeling/v1beta1:datalabeling-v1beta1-py']' returned non-zero exit status 1.
2020-06-30 05:48:49,723 autosynth [ERROR] > Synthesis failed
2020-06-30 05:48:49,723 autosynth [DEBUG] > Running: git reset --hard HEAD
HEAD is now at 880f470 chore: Migrate python-datalabeling synth.py from artman to bazel (#13)
2020-06-30 05:48:49,730 autosynth [DEBUG] > Running: git checkout autosynth-self
Switched to branch 'autosynth-self'