Add support for standalone prometheus

Add federation target

Partial-fix: PROD-17350

Change-Id: Ia08e7b2203fb2df73e57073bf56c24f19cc0c4b7
diff --git a/prometheus/server/target/federation/init.yml b/prometheus/server/target/federation/init.yml
new file mode 100644
index 0000000..564af82
--- /dev/null
+++ b/prometheus/server/target/federation/init.yml
@@ -0,0 +1,17 @@
+parameters:
+  prometheus:
+    server:
+      target:
+        static:
+          prometheus:
+            endpoint:
+             - address: 127.0.0.1
+               port: ${prometheus:server:bind:port}
+          prometheus_federation:
+            honor_labels: true
+            metrics_path: '/federate'
+            scrape_interval: 15s
+            scrape_timeout: 15s
+            endpoint:
+             - address: ${_param:stacklight_monitor_address}
+               port: 15010