is there a way to show Nifi metrics (like processors' in/out counters) in Grafana? or at least export them to external database (like Prometheus)?
in HDF 2.0.1 it goes to ambari metrics which has grafana
In addition to what Tim Spann said, you can also implement a custom ReportingTask to send metrics to any system you like. See the AmbariReportingTask for reference: