Document endpoints.kubernetes.io/managed-by

Author: danwinship

content/en/docs/reference/labels-annotations-taints/_index.md

@@ -1341,6 +1341,23 @@ records the date (ISO 8601 format, UTC time zone) when the control plane detects
 that the auto-generated Secret has not been used for a specified duration
 (defaults to one year).
 
+### endpoints.kubernetes.io/managed-by (deprecated) {#endpoints-kubernetes-io-managed-by}
+
+Type: Label
+
+Example: `endpoints.kubernetes.io/managed-by: endpoint-controller`
+
+Used on: Endpoints
+
+This label is used internally to mark Endpoints objects that were created by
+Kubernetes (as opposed to Endpoints created by users or external controllers).
+
+{{< note >}}
+The [Endpoints](/docs/reference/kubernetes-api/service-resources/endpoints-v1/)
+API is deprecated in favor of
+[EndpointSlice](/docs/reference/kubernetes-api/service-resources/endpoint-slice-v1/).
+{{< /note >}}
+
 ### endpointslice.kubernetes.io/managed-by {#endpointslicekubernetesiomanaged-by}
 
 Type: Label
@@ -1351,7 +1368,9 @@ Used on: EndpointSlices
 
 The label is used to indicate the controller or entity that manages the EndpointSlice. This label
 aims to enable different EndpointSlice objects to be managed by different controllers or entities
-within the same cluster.
+within the same cluster. The value `endpointslice-controller.k8s.io` indicates an
+EndpointSlice object that was created automatically by Kubernetes for a Service with a
+{{< glossary_tooltip text="selectors" term_id="selector" >}}.
 
 ### endpointslice.kubernetes.io/skip-mirror {#endpointslicekubernetesioskip-mirror}