Jellyfin:ScanLeader:Enabled defaults to false and nothing sets it, so
leader election never runs and every replica executes the timer-driven
library tasks concurrently - the exact behaviour the lease prevents.
- Enable gating by default when a Redis connection string is configured
- Honour an explicit Enabled setting either way
- Carry the effective decision onto the bound options the task worker reads
- Log at startup whether gating is active
- Warn when gating is enabled but no Redis connection string is configured
Timer-driven library tasks fire on every replica, so a library refresh or a
database optimise runs once per pod against the same shared library.
- add IScanLeaderLease with a Redis TTL implementation and a no-op default
- skip timer-driven runs of the gated tasks on instances without the lease
- treat an unreachable Redis as holding the lease so tasks never stop running
- leave manual and API-triggered runs ungated
unkin-agent