We have observed sample build job failures on all different python versions for the pull requests. This is likely caused by cleanup_old_sinks method failing to clean up some of the storage sinks. We found storage sinks sink-storage- still exists after the clean up job.

We've temporarily resolved the issue by manually deleting the sinks, and subsequent sample builds are now passing. This work item tracks the failure of cleanup_old_sinks to remove storage sinks.