TisonKun commented on issue #7340: [FLINK-11174] [prometheus] Flink Metrics Prometheus label values supp… URL: https://github.com/apache/flink/pull/7340#issuecomment-449320499 @zentol for the future side, Prometheus would still support UTF-8 as above. for current status, [official document](https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels) clarifies that "Label values may contain any Unicode characters"
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