Allow to deploy prometheus as standalone service

Now it is able to install proemtheus on host and
use it to scrape data from other prometheuses.

Prod-related: PROD-17350

Change-Id: I11d65920c0e9b685dead22a5551521fa15d13f25
diff --git a/metadata/service/relay/init.yml b/metadata/service/relay/init.yml
new file mode 100644
index 0000000..31608f8
--- /dev/null
+++ b/metadata/service/relay/init.yml
@@ -0,0 +1,12 @@
+applications:
+  - prometheus
+classes:
+ - service.prometheus.support
+parameters:
+  _param:
+    prometheus_relay_bind_port: 8080
+  prometheus:
+    relay:
+      enabled: true
+      bind:
+        port: ${_param:prometheus_relay_bind_port}