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After installing Prometheus, by connecting to its dashboard, you will notice a list of services already under monitoring: these are useful resources for the functioning of Prometheus itself (e.g. alertmanager, Grafana) or typical of each K8s cluster (apiserver, controller-manager, scheduler ). But how do you monitor an application in general? As an example, let's try to monitor Longhorn, a distributed block storage system for Kubernetes.

ServiceMonitor

The heart of everything are the service monitors, an intermediate layer between the application to be monitored and the Prometheus operator. Within this component it is necessary to indicate which are the "coordinates" of the K8s service associated with the application. In our case we are interested in the longhorn-backend service. Let's try to print some information about it

LH services 
$ k get svc -n longhorn-system --show-labels
NAME                TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)     AGE   LABELS
csi-attacher        ClusterIP   10.233.13.82    <none>        12345/TCP   24h   app=csi-attacher,longhorn.io/managed-by=longhorn-manager
csi-provisioner     ClusterIP   10.233.62.177   <none>        12345/TCP   24h   app=csi-provisioner,longhorn.io/managed-by=longhorn-manager
csi-resizer         ClusterIP   10.233.40.134   <none>        12345/TCP   24h   app=csi-resizer,longhorn.io/managed-by=longhorn-manager
csi-snapshotter     ClusterIP   10.233.19.24    <none>        12345/TCP   24h   app=csi-snapshotter,longhorn.io/managed-by=longhorn-manager
longhorn-backend    ClusterIP   10.233.19.4     <none>        9500/TCP    24h   app.kubernetes.io/instance=longhorn,app.kubernetes.io/managed-by=Helm,app.kubernetes.io/name=longhorn,app.kubernetes.io/version=v1.1.2,app=longhorn-manager,helm.sh/chart=longhorn-1.1.2
longhorn-frontend   ClusterIP   10.233.62.6     <none>        80/TCP      24h   app.kubernetes.io/instance=longhorn,app.kubernetes.io/managed-by=Helm,app.kubernetes.io/name=longhorn,app.kubernetes.io/version=v1.1.2,app=longhorn-ui,helm.sh/chart=longhorn-1.1.2
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