Add static targets and 'enabled' param for targets

Change-Id: I73c53296c07fb6626767ac468889d84eaa66f877
diff --git a/prometheus/server/target/etcd.yml b/prometheus/server/target/etcd.yml
index 3db134e..4cd04bf 100644
--- a/prometheus/server/target/etcd.yml
+++ b/prometheus/server/target/etcd.yml
@@ -4,6 +4,7 @@
       target:
         static:
           etcd:
+            enabled: true
             scheme: https
             tls_config:
               skip_verify: true