Adding ETCD endpoint to Prometheus

Change-Id: Ie38b719dac648fb977acfdf1514c5e43b7be7dd2
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 45595d3..c00d3e0 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -52,6 +52,12 @@
     #    datacenter: onf-menlo
 
   extraScrapeConfigs: |
+    - job_name: 'etcd-metrics'
+      metrics_path: /metrics
+      scrape_interval: 15s
+      static_configs:
+        - targets:
+            - etcd-cluster-client:2379
     - job_name: 'xos-core'
       metrics_path: /metrics
       scrape_interval: 15s