Add support for standalone prometheus

Add federation target

Partial-fix: PROD-17350

Change-Id: Ia08e7b2203fb2df73e57073bf56c24f19cc0c4b7
diff --git a/prometheus/relay/init.yml b/prometheus/relay/init.yml
new file mode 100644
index 0000000..a240458
--- /dev/null
+++ b/prometheus/relay/init.yml
@@ -0,0 +1,3 @@
+classes:
+ - service.prometheus.relay
+ - service.prometheus.relay.cluster