The Kubernetes API provides a mechanism to extend its functionality through Custom Resource Definitions (CRDs). Monitoring changes to these custom resources is essential for reacting to state modifications, triggering reconciliation loops, or gathering operational metrics. Utilizing a single informer to observe modifications across multiple CRD types optimizes resource consumption and simplifies code management compared to deploying individual informers for each CRD.
Employing a shared informer reduces the overhead associated with managing multiple connections to the Kubernetes API server. It also offers a consolidated view of events across different custom resources, facilitating coordinated responses and policy enforcement. Historically, managing numerous CRDs required significant operational complexity; a unified approach streamlines this process.
