Chesnay Schepler created FLINK-9665:
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Summary: PrometheusReporter does not properly unregister metrics
Key: FLINK-9665
URL: https://issues.apache.org/jira/browse/FLINK-9665
Project: Flink
Issue Type: Bug
Components: Metrics
Affects Versions: 1.4.2, 1.5.0, 1.6.0
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
The {{PrometheusReporter}} groups metrics with the same logical scope in a
single {{Collector}} which are periodically polled by Prometheus.
New metrics are added to an existing collector, and a reference count is
maintained so we can eventually cleanup the {{Collector}} itself.
For removed metrics we decrease the reference count, do not however remove the
metrics that were added. As a result the collector will continue to expose
metrics, as long as at least 1 metric exists with the same logical scope.
If the collector is a {{io.prometheus.client.Gauge}} we can use the
{{#remove()}} method. For histograms we will have to modify our
{{HistogramSummaryProxy}} class to allow removing individual histograms.
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