[GitHub] [druid] michaelschiff opened a new pull request #8621: prometheus-emitter

[GitBox <gi...@apache.org>]

michaelschiff opened a new pull request #8621: prometheus-emitter
URL: https://github.com/apache/druid/pull/8621
 
 
   Adds a new extension `prometheus-emitter` to expose Druid metrics for collection directly by a Prometheus server.
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added documentation for new or modified features or behaviors.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in [licenses.yaml](https://github.com/apache/incubator-druid/blob/master/licenses.yaml)
   - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
   - [x] added unit tests or modified existing tests to cover new code paths.
   - [ ] added integration tests.
   - [x] been tested in a test Druid cluster.
   
   ##### Key changed/added classes in this PR
    * `org.apache.druid.emitter.prometheus.*`
   

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