Prometheus Reporting Task for NiFi

[S Bhandiwad, Satwik (Nokia - IN/Bangalore)]

Hi Team,

I have an open PR. It would be great if this gets included in 1.9 release.
https://github.com/apache/nifi/pull/3257
https://issues.apache.org/jira/browse/NIFI-5435

Thanks,
Satwik