Allow configuring CORS origin.

Fixes: PROD-35204
Change-Id: Ib717ca16eb8a6e58da663a47f5bc65e7c5bdb14c
diff --git a/metadata/service/server/container.yml b/metadata/service/server/container.yml
index 222e703..29de13d 100644
--- a/metadata/service/server/container.yml
+++ b/metadata/service/server/container.yml
@@ -10,10 +10,12 @@
     prometheus_scrape_interval: "15s"
     prometheus_scrape_timeout: "15s"
     prometheus_storage_retention: "360h"
+    prometheus_cors_origin: ".*"
   prometheus:
     server:
       enabled: true
       is_container: true
+      cors_origin: ${_param:prometheus_cors_origin}
       use_grains:
         target: true
         recording: true