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* admin: re-send the master vacuum disable every poll so it survives leader changes
The admin disabled the master's scheduled vacuum only when a vacuum plugin
worker connected or disconnected. The master keeps that flag in memory and it
is not replicated through raft, so after a leader change or a leader restart
the new leader ran its own vacuum next to the plugin worker. When both picked
the same volume the master's commit failed ("compact swap aborted: missing
.cpd/.cpx") and it dropped that replica, leaving the volume under-replicated.
Send the desired state on every poll instead, and log on the master only
when the flag actually changes.
* admin: shorten the vacuum sync comments
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Kevin <kevin@leetify.com>
Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>