Delete Prometheus labels for deleted queues #305
Merged
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What
Track which queues are present in the most recent Collect for each cluster, and delete them from the metrics when they are no longer there.
Possible fix for #304
Why
#296 removed some code that was well-intentioned, but heavy-handed, and didn't make sense in a setup monitoring more than one cluster (or a cluster and unclustered...) But then there was nothing to remove old queues, which is a potential memory issue (minor) and causes metrics for deleted queues to get stuck on the last value (confusing).