Merge pull request #821 from prometheus/fish/add-k8s-ingrss

Add k8s ingress discovery

content/docs/operating/configuration.md

@@ -653,6 +653,22 @@ Available meta labels:
 * If the endpoints belong to a service, all labels of the `role: service` discovery are attached.
 * For all targets backed by a pod, all labels of the `role: pod` discovery are attached.
 
+#### `ingress`
+
+The `ingress` role discovers a target for each path of each ingress.
+This is generally useful for blackbox monitoring of an ingress.
+The address will be set to the host specified in the ingress spec.
+
+Available meta labels:
+
+* `__meta_kubernetes_namespace`: The namespace of the ingress object.
+* `__meta_kubernetes_ingress_name`: The name of the ingress object.
+* `__meta_kubernetes_ingress_label_<labelname>`: The label of the ingress object.
+* `__meta_kubernetes_ingress_annotation_<annotationname>`: The annotation of the ingress object.
+* `__meta_kubernetes_ingress_scheme`: Protocol scheme of ingress, `https` if TLS
+  config is set. Defaults to `http`.
+* `__meta_kubernetes_ingress_path`: Path from ingress spec. Defaults to `/`.
+
 
 See below for the configuration options for Kubernetes discovery: