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 As an example, let's try to monitor Longhorn, a distributed block storage system for Kubernetes.
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# This is just an excerpt from the output of the "describe" command $ kubectl describe -n monitoring prometheus spec: Service Monitor serviceMonitorSelectorSelector: matchLabelsMatch Labels: releaseRelease: mon |
After a few seconds, connecting to the Target list of the Prometheus dashboard, you will notice a new line. Of course, you will have Longhorn Metrics for Monitoring available to keep your application under control at all times.
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