piygoyal opened a new pull request #8568: [FLINK-7697][connectors] Add metrics 
for ElasticSearchSink
URL: https://github.com/apache/flink/pull/8568
 
 
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   ## What is the purpose of the change
   
   This pull request add metrics to the Elasticsearch connectors, to make it 
easier to operate and monitor in a production environment.
   
   ## Brief change log
   
   The following metrics have been added:
    - ItemRequest success count (counter)
    - ItemRequest failure count (counter) grouped by error type.
    - BulkRequest failure count (counter) grouped by error type.
    - BulkRequest latency (gauge)
   
   Note: Gauge doesn't feel like the right metric type for measuring 
bulkRequest latency, as it will only capture the last requestLatency before the 
gauge gets polled. Flink metric system currently lacks a timer type that can be 
used to capture event latencies in a richer way. I opened FLINK-12680 to track 
addition of a timer type.
   Another metric-related thing we noticed during internal reviews is that the 
SimpleCounter is not thread safe, which makes it somewhat risky/expensive to 
use it in a multithreaded context. I opened FLINK-12681 to track making 
SimpleCounter thread-safe.
   
   
   ## Verifying this change
   
   This change is a trivial rework / code cleanup without any test coverage. 
Also manually verified the metrics by hooking with our internal time-series 
system.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (no)
     - If yes, how is the feature documented? (not applicable)
   

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