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/server/container.yml b/metadata/service/server/container.yml
index 663092a..7f170b7 100644
--- a/metadata/service/server/container.yml
+++ b/metadata/service/server/container.yml
@@ -11,6 +11,11 @@
   prometheus:
     server:
       enabled: true
+      is_container: true
+      use_grains:
+        target: true
+        recording: true
+        alert: true
       dir:
         config: /srv/volumes/prometheus/server
         config_in_container: /srv/prometheus