[GitHub] [hadoop-ozone] vivekratnavel opened a new pull request #1390: HDDS-4196. Add an endpoint in Recon to query Prometheus

[GitBox]

vivekratnavel opened a new pull request #1390:
URL: https://github.com/apache/hadoop-ozone/pull/1390


   ## What changes were proposed in this pull request?
   
   - Add a metrics proxy endpoint to query metrics service providers like 
prometheus. 
     Example: 
`<recon_endpoint>/api/v1/metrics/query?query=ratis_leader_election_electionCount`
 will be proxied to 
`<prometheus_endpoint>/api/v1/query?query=ratis_leader_election_electionCount`
   - Add a new config "ozone.recon.prometheus.http.endpoint" to configure 
Prometheus endpoint. The proxy endpoint (/api/v1/metrics) will respond with an 
error if Prometheus endpoint is not configured.
   - Include `ratis_leader_election_electionCount` and 
`ratis_leader_election_lastLeaderElectionTime` metrics as part of the pipeline 
endpoint response if prometheus is configured.
   **Note:** At this point `ratis_leader_election_lastLeaderElectionTime` is 
still not available and is tracked via 
https://issues.apache.org/jira/browse/RATIS-1049
   - Add unit tests 
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-4196
   
   ## How was this patch tested?
   
   This patch was tested with unit tests and by verifying the Recon UI in a 
docker-compose cluster.
   <img width="1403" alt="Screen Shot 2020-09-03 at 12 57 02 PM" 
src="https://user-images.githubusercontent.com/1051198/92161163-0f682a80-ede5-11ea-8c3a-93fb26117a09.png";>
   
   


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