TessaIO commented on issue #17932:
URL: https://github.com/apache/druid/issues/17932#issuecomment-2813093510

   @kfaraz  By going down (for A), I meant that it gets restarted, so when it 
goes up again, it will emit the heartbeat metric.
   For B the problem is when we work timeseries monitoring system like 
Prometheus, the old metric of `service/heartbeat` with `leader=0` would still 
be present with a value of 1, and it doesn't get decremented


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