[Operator and Observability] Create alerts

What

For SRE or a customer to manage Camel K, they need to be notified if there is an issue occurring or degraded service, for example, the UI is unreachable or the API request duration has been above 10s for the last 5 mins.

How

The alerts are PrometheusRule resources. This will be the same as the creation and reconciliation of other child resources created as part of a Camel-K operator deployment and IntegrationPlatform CR instantiation, for example, the deployment resource.

Futher Information:

• Define Alerts

Note:

• This could be feature flagged in the CR spec and only created if turned on
• The prometheus operator needs to be installed on cluster for the PrometheusRule CR kind to exist. It is easy to check for the existence of a resource kind using the following code

  import (
  	"github.com/operator-framework/operator-sdk/pkg/k8sutil"
  	"k8s.io/client-go/discovery"
  	"k8s.io/client-go/rest"
  )
  
  ...
  
  // hasServiceMonitor checks if ServiceMonitor is registered in the cluster.
  func hasServiceMonitor(config *rest.Config) (bool, error) {
  	dc := discovery.NewDiscoveryClientForConfigOrDie(config)
  	apiVersion := "monitoring.coreos.com/v1"
  	kind := "PrometheusRule"
  
  	return k8sutil.ResourceExists(dc, apiVersion, kind)
  }