[jsdoc] Add alert for build liveness.
[jsdoc] Add alert for build liveness.

Bug: skia:
Change-Id: Id57fcb403fc2e71f5caf9fc989a2b51a0791402f
Reviewed-on: https://skia-review.googlesource.com/113663
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot