Add Kubernetes pod name to metrics discovered from service endpoints

* Prometheus queries from some upstreams use joins of node-exporter
and kube-state-metrics metrics by (namespace,pod). Add the Kubernetes
pod name to service endpoint metrics
* Rename the kubernetes_namespace field to namespace
* Honor labels since kube-state-metrics already include a `pod` field
that should not be overridden

addons/prometheus/config.yaml

@@ -119,10 +119,10 @@ data:
     # * `prometheus.io/port`: If the metrics are exposed on a different port to the
     # service then set this appropriately.
     - job_name: 'kubernetes-service-endpoints'
-
       kubernetes_sd_configs:
       - role: endpoints
 
+      honor_labels: true
       relabel_configs:
       - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape]
         action: keep
@@ -144,7 +144,10 @@ data:
         regex: __meta_kubernetes_service_label_(.+)
       - source_labels: [__meta_kubernetes_namespace]
         action: replace
-        target_label: kubernetes_namespace
+        target_label: namespace
+      - source_labels: [__meta_kubernetes_pod_name]
+        action: replace
+        target_label: pod
       - source_labels: [__meta_kubernetes_service_name]
         action: replace
         target_label: job
@@ -177,7 +180,7 @@ data:
       - action: labelmap
         regex: __meta_kubernetes_service_label_(.+)
       - source_labels: [__meta_kubernetes_namespace]
-        target_label: kubernetes_namespace
+        target_label: namespace
       - source_labels: [__meta_kubernetes_service_name]
         target_label: job