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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