Add metrics for synapse

hosts/dingserver/synapse.nix

@@ -13,6 +13,7 @@ in {
   services.matrix-synapse = {
     enable = true;
     settings = {
+      enable_metrics = true;
       server_name = "broccoli.town";
       database = {
         name = "psycopg2";
@@ -35,6 +36,16 @@ in {
             }
           ];
         }
+        {
+          port = 9000;
+          type = "metrics";
+          tls = false;
+          bind_addresses = [
+            "0.0.0.0"
+          ];
+          resources = [
+          ];
+        }
       ];
     };
   };