[jira] [Created] (FLINK-9898) Prometheus metrics reporter doesn't respect `metrics.scope`

["Prithvi Raj (JIRA)" <ji...@apache.org>]

Prithvi Raj created FLINK-9898:
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             Summary: Prometheus metrics reporter doesn't respect `metrics.scope`
                 Key: FLINK-9898
                 URL: https://issues.apache.org/jira/browse/FLINK-9898
             Project: Flink
          Issue Type: Bug
          Components: Metrics
    Affects Versions: 1.5.1, 1.4.2, 1.4.1, 1.5.0, 1.4.0
            Reporter: Prithvi Raj


The Apache Flink [documentation|https://ci.apache.org/projects/flink/flink-docs-release-1.5/monitoring/metrics.html#system-scope] details that users may change the default scope of metrics emitted by using a scope format. 

Changing the scope format allows end users to store metrics with lower cardinality while introducing the drawback of being unable to differentiate between metrics from different tasks/operators/etc sharing the same name. 

With the Prometheus reporter, regardless of the scope format used, every variable is always emitted. 

Would it be reasonable for the Prometheus reporter to respect the scope format and only emit dimensions that are in scope?



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