Create a Prometheus ServiceMonitor object that can capture/collect metrics from deployed SonataFlow instances

[ricardozanini]

Description

The operator can track in the cluster if Prometheus Operator is installed. If this condition is true and the SonataFlowPlatform is marked with .spec.monitoring: true, then each workflow instance can have a ServiceMonitor object bound to it.

Implementation ideas

Each SonataFlow already exposes a Service. Hence, in this issue, it's expected that each ServiceMonitor instance binds to it.

Verify with kogito-runtimes the endpoints to scrap for metrics (should be /metrics).

Prereqs

• Prometheus operator is installed
• Prometheus CR is already deployed and configured in the cluster. The operator won't provision a Prometheus server.