restrict access to metrics endpoint in subdomain

https://jellyfin.org/docs/general/networking/monitoring/#prometheus-metrics

Author: ltp

jellyfin.subdomain.conf.sample

@@ -37,4 +37,22 @@ server {
         proxy_pass $upstream_proto://$upstream_app:$upstream_port;
 
     }
+
+    # Restrict access to /metrics
+    # https://jellyfin.org/docs/general/networking/monitoring/#prometheus-metrics
+    location /jellyfin/metrics {
+        allow 192.168.0.0/16;
+        allow 10.0.0.0/8;
+        allow 172.16.0.0/12
+        allow 127.0.0.0/8;
+
+        deny all;
+
+        include /config/nginx/proxy.conf;
+        include /config/nginx/resolver.conf;
+        set $upstream_app jellyfin;
+        set $upstream_port 8096;
+        set $upstream_proto http;
+        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
+    }
 }