YongGang opened a new pull request, #14593:
URL: https://github.com/apache/druid/pull/14593
### Description
leader dimension should be exposed in service/heartbeat metric into
statsd-reporter, need to summarize in this dimension for alerting.
#### Release note
Expose leader dimension in service/heartbeat metric into statsd-reporter
<hr>
##### Key changed/added classes in this PR
* Modify the service/heartbeat metric entry in
defaultMetricDimensions.json to expose the leader dimension.
<hr>
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- [ ] been tested in a test Druid cluster.
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