Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
AgentsArea: what it touches
Internal ChangesKind: in v2.1.224,
Internal ChangesSection of the release
What
Two mailbox maintenance paths now release their lock through a shared helper that takes an operation name, so a failed release is attributed to the specific job, such as pruning invalid entries or marking messages read.
Evidence
pruneInvalidMailboxEntries
Strings lifted out of the shipped bundle, so the claim above can be checked against them.