Github user tillrohrmann commented on a diff in the pull request: https://github.com/apache/flink/pull/2219#discussion_r70577752 --- Diff: flink-core/src/main/java/org/apache/flink/metrics/MetricRegistry.java --- @@ -64,6 +66,15 @@ public MetricRegistry(Configuration config) { } this.scopeFormats = scopeFormats; + char delim; + try { + delim = config.getString(ConfigConstants.METRICS_SCOPE_DELIMITER, ".").charAt(0); --- End diff -- Sorry, it was a hick-up of Github, because it didn't show me that I posted the comment so I thought I clicked on cancel. Why not changing `ScopeFormat.concat` such that it always takes a delimiter string as first parameter? Giving `""` as first argument will lead to the former variant where you don't specify a delimiter.
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