kaibozhou commented 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. The groupingKey is just a global tag that applied to all metrics. 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.
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