zentol opened a new pull request #8307: [FLINK-12359][metrics][tests] Harden 
SystemResourcesMetricsITCase
URL: https://github.com/apache/flink/pull/8307
 
 
   ## What is the purpose of the change
   
   Hardens the `SystemResourcesMetricsITCase` against
   * slow starts of a TaskManager, in which case metrics could be registered 
later than the test expects
   * the host portion of the metric identifier not being `localhost`
   
   We now exclude the host from the identifier, and generate a future in the 
reporter that we wait on instead.
   

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