Monitoring

You can’t fix what you can’t see. You can’t optimize what you can’t measure. Prometheus is the standard for Kubernetes metrics. It works beautifully — until you need long-term storage, or multiple clusters, or high availability. Then you hit its limits. Thanos extends Prometheus without replacing it. Keep your existing setup, add Thanos components, get unlimited retention and global querying. The Problem with Standalone Prometheus Prometheus has built-in limitations: Single node — No native clustering or HA Local storage — Retention limited by disk size Single cluster view — Can’t query across clusters No downsampling — Old data takes as much space as new For a single small cluster with 2 weeks retention, these aren’t problems. For production multi-cluster environments with compliance requirements, they’re blockers. ...

GitOps promises that Git is the source of truth. But what if someone kubectl edits a deployment? What if a mutating webhook changes a resource? What if the cluster silently diverges from what Git says it should be? This is configuration drift, and it’s one of the most insidious problems in Kubernetes operations. ArgoCD can help you detect it — if you configure it correctly. What Is Configuration Drift? Drift happens when the actual state of your cluster differs from the desired state in Git. ...