Junrui Li created FLINK-32217:
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Summary: Retain metric store can cause NPE
Key: FLINK-32217
URL: https://issues.apache.org/jira/browse/FLINK-32217
Project: Flink
Issue Type: Bug
Components: Runtime / Metrics
Affects Versions: 1.17.0
Reporter: Junrui Li
Fix For: 1.18.0, 1.16.3, 1.17.2
When metricsFetcher fetches metrics, it will update the metricsStore
([here|https://github.com/apache/flink/blob/d6c3d332340922c24d1af9dd8835d0bf790184b5/flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/legacy/metrics/MetricStore.java#LL91C44-L91C44]).
But in this method, it can get null metricStore and cause NPE, which will lead
to incorrect results of metrics retain, and we should also fix it from the
perspective of stability.
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