[jira] [Created] (FLINK-20520) Document that metric names can contain characters that need to be escaped

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-20520:
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             Summary: Document that metric names can contain characters that need to be escaped
                 Key: FLINK-20520
                 URL: https://issues.apache.org/jira/browse/FLINK-20520
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, Runtime / Metrics, Runtime / REST
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.13.0






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