Expose metrics to Prometheus

[astefanutti]

A common set of Camel-K related metrics could be exposed to Prometheus for monitoring purpose.

Besides, It would be cool if it'd be possible to define some custom Prometheus metrics, directly in the custom resource.

Problably the JMX Prometheus Java agent would have to be enabled (configurably) and fragments would look like:

rules:
  - pattern: 'fis.metrics<name=os.(.*)><>(.+):'
    name: os_$1
    help: some help

  - pattern: 'org.apache.camel<context=camel, type=routes, name=\"(.*)\"><>LastProcessingTime'
    name: camel_last_processing_time
    help: Last Processing Time [milliseconds]
    type: GAUGE
    labels:
      route: $1

[lburgazzoli]

@astefanutti do you want to help ?

[astefanutti]

@lburgazzoli for sure. I need to get into the codeline. If you have some direction or guidelines already, I'd be happy to follow your lead!

[lburgazzoli]

I think you can try following the readme and the docs so we can also see what's missing there, then if you need help ping us on gitter

[lburgazzoli]

I think it would be to leverage traits to configure Prometheus/Jolokia

[astefanutti]

Agreed. That's what I had in mind a priori.

[astefanutti]

The Prometheus trait has been created and should be available in next release (a priori 0.3.0).