Minor The running thread metric is an estimation between the lag and the number of partitions of the stream:
https://github.com/nuxeo/nuxeo/blob/2021/modules/core/nuxeo-core-event/src/main/java/org/nuxeo/ecm/core/work/StreamWorkManager.java#L521
But the number of partition is missing the namespace, as the result it uses the defaultPartitions (4).
Also, because of the missing namespace, WorkManager queue identifier that contains an hyphen (like foo-bar below) will raise an exception:
2023-02-12T00:00:00,383 WARN [prometheus-http-1-5] [io.opencensus.exporter.metrics.util.MetricReader] Exception thrown by the metrics exporter.
java.lang.IllegalArgumentException: Invalid name without namespace: 'foo-bar'
at org.nuxeo.lib.stream.log.Name.checkLogNameWithoutNamespace(Name.java:129) ~[nuxeo-stream-2021.29.7.jar:?]
at org.nuxeo.lib.stream.log.Name.<init>(Name.java:60) ~[nuxeo-stream-2021.29.7.jar:?]
at org.nuxeo.lib.stream.log.Name.ofUrn(Name.java:78) ~[nuxeo-stream-2021.29.7.jar:?]
at org.nuxeo.lib.stream.computation.Settings.getPartitions(Settings.java:151) ~[nuxeo-stream-2021.29.7.jar:?]
at org.nuxeo.ecm.core.work.StreamWorkManager.getMetrics(StreamWorkManager.java:521) ~[nuxeo-core-event-2021.30.14.jar:?]
