Generate performance data for custom plugins

[mirshahriar]

Icinga2 nagios plugins usually generate performance data. This features are missing from AppsCode custom plugins

https://docs.icinga.com/icinga2/latest/doc/module/icinga2/chapter/icinga2-features 16.4. Performance Data

https://docs.icinga.com/icinga2/latest/doc/module/icinga2/chapter/object-types#objecttype-perfdatawriter

Enable feature https://docs.icinga.com/icinga2/latest/doc/module/icinga2/chapter/addons

[tamalsaha]

I think we might also think about exporting this data to Prometheus.

[tamalsaha]

Run a push gateway side car with operator and push these metrics to that https://github.com/prometheus/pushgateway