Disallow public access to strfry metrics endpoint

site-cookbooks/kosmos_strfry/templates/nginx_conf_strfry.erb

@@ -31,6 +31,10 @@ server {
     proxy_pass http://_substr;
   }
 
+  location /metrics {
+    return 404;
+  }
+
   location / {
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;