Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
InternalsArea: what it touches
Internal ChangesKind: in v2.1.224,
Internal ChangesSection of the release
What
When a storage handle is supplied, session registration writes its process-id file through that store and throws on failure; without one it falls back to writing the file directly to disk as before.
Evidence
v5 pid-file write failed
Strings lifted out of the shipped bundle, so the claim above can be checked against them.