Kubernetes SD: Update example config to use endpoints role for API server discovery

documentation/examples/prometheus-kubernetes.yml

@@ -28,9 +28,13 @@ scrape_configs:
     # insecure_skip_verify: true
   bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
 
-  static_configs:
-  - targets:
-    - kubernetes.default.svc
+  # Keep only the default/kubernetes service endpoints for the https port. This
+  # will add targets for each API server which Kubernetes adds an endpoint to
+  # the default/kubernetes service.
+  relabel_configs:
+  - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
+    action: keep
+    regex: default;kubernetes;https
 
 - job_name: 'kubernetes-nodes'