num_columns_recent >= 20 for presubmit prowjobs.
num_columns_recent >= 20 for presubmit prowjobs.

GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid,GoogleCloudPlatform/testgrid