High CPU utilization and memory bloat in Kubernetes Operators are frequently self-inflicted wounds. The most common culprit isn't inefficient reconciliation logic, but rather reconciling too often . If your operator reacts to every single event emitted by the API server, your workqueue is likely flooded with noise. Metadata updates, lease renewals, status condition timestamps, and managedFields changes trigger the standard Reconcile loop by default. For a cluster with hundreds of Custom Resources (CRs), this results in thousands of wasted cycles processing objects that haven't materially changed. This post details how to implement predicate.Predicate in the Controller Runtime to filter out irrelevant events and strictly control when your logic executes. The Root Cause: The Noise of the API Server Kubernetes controllers rely on the Informer pattern. They watch for changes to resources. However, the definition of a "change" in Kubernetes i...
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