- ServerCheckJob uses the stored reachability state instead of a second SSH
probe. One failed probe no longer marks the server unreachable without
UNREACHABLE_THRESHOLD or marks all its resources exited.
- Do not dispatch ServerCheckJob for build servers and Swarm workers.
- Check cloud provider state every 5 minutes instead of every minute.
- ServerPatchCheckJob uses isFunctional() and drops the unused retries.
- Delete the unused ServerCleanupMux job.
- Disable SSH multiplexing per command. The global config change stayed in
the queue worker, so later jobs (also deployments) ran without mux.
