Backport of "identity: Unblock condition variable on FLUSH_START" into 1.16
Backport of !390 (merged) "identity: Unblock condition variable on FLUSH_START".
Needs manual intervention, cherry-picking failed!
Commits:
Backport of !390 (merged) "identity: Unblock condition variable on FLUSH_START".
Needs manual intervention, cherry-picking failed!
Commits: