Allow configuring CORS origin.

Fixes: PROD-35204
Change-Id: Ib717ca16eb8a6e58da663a47f5bc65e7c5bdb14c
diff --git a/metadata/service/server/standalone.yml b/metadata/service/server/standalone.yml
index 40dbc7f..921001c 100644
--- a/metadata/service/server/standalone.yml
+++ b/metadata/service/server/standalone.yml
@@ -9,10 +9,12 @@
     prometheus_scrape_interval: "15s"
     prometheus_storage_retention: "4320h"
     prometheus_server_bind_port: 9090
+    prometheus_cors_origin: ".*"
   prometheus:
     server:
       enabled: true
       is_container: false
+      cors_origin: ${_param:prometheus_cors_origin}
       use_grains:
         target: false
         recording: false