I recently learned about helm and how easy it is to deploy the whole prometheus stack for monitoring a Kubernetes cluster, so I decided to try it out on a staging cluster at my work.
I started by creating a dedicates namespace on the cluster for monitoring with:
kubectl create namespace monitoring
Then, with helm, I added the prometheus-community repo with:
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
Next, I installed the chart with a prometheus release name:
helm install prometheus prometheus-community/kube-prometheus-stack -n monitoring
At this time I didn't pass any custom configuration because I'm still trying it out.
After the install is finished, it all looks good. I can access the prometheus dashboard with:
kubectl port-forward prometheus-prometheus-kube-prometheus-prometheus-0 9090 -n monitoring
There, I see a bunch of pre-defined alerts and rules that are monitoring but the problem is that I don't quite understand how to create new rules to check the pods in the default namespace, where I actually have my services deployed.
I am looking at http://localhost:9090/graph to play around with the queries and I can't seem to use any that will give me metrics on my pods in the default namespace.
I am a bit overwhelmed with the amount of information so I would like to know what did I miss or what am I doing wrong here?