Add metrics for synapse

hosts/dingserver/caddy.nix

@@ -8,6 +8,13 @@
   services.caddy = {
     enable = true;
     virtualHosts = {
+
+      "http://metrics.town" = {
+        extraConfig = ''
+          reverse_proxy http://localhost:3000
+        '';
+      };
+
       "matrix.broccoli.town" = {
         extraConfig = ''
           reverse_proxy /_matrix/* http://localhost:8008

hosts/dingserver/configuration.nix

@@ -11,6 +11,7 @@
     ./caddy.nix
     ./synapse.nix
     ./syncthing.nix
+    ./prometheus.nix
   ];
 
   # Force disable the common boot loader

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 = [
+          ];
+        }
       ];
     };
   };