kaibozhou edited a comment on issue #9517: [FLINK-13779][metrics] PrometheusPushGatewayReporter support push metrics with groupingKey URL: https://github.com/apache/flink/pull/9517#issuecomment-524689138 Hi, @StephanEwen @zentol Thanks for your review. And if users do not specify groupingKey, the reporter will pass null which will be ignored by pushGateway. So it has no impact on the way of using the push gateway without grouping keys. The groupingKey is not just a global tag that applied to all metrics, but is also to specify the groups. From the doc of [pushgateway](https://github.com/prometheus/pushgateway#command-line): > "Pushed metrics are managed in groups, identified by a grouping key of any number of labels, of which the first must be the job label. The groups are easy to inspect via the web interface." It is a special kind of label for pushgateway. The following two pictures are the tests I made.   Thanks Kaibo
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