od watches for so you can easily ignore changes from namespaces that aren’t a concern for the mesh (e.g. a set of Spark Jobs).</p><p>You can think of them as a bit like Istio’s Sidecar API resources but for Istiod itself: a <code>Sidecar</code> resource limits the set of configuration that Istiod will send to Envoy. Discovery Selectors limit the set of configurations that Istio will receive and process from Kubernetes.</p><p><a href=/v1.25/blog/2021/discovery-selectors/>Check out the great write-up</a> 