add synapse metrics

nixos/hosts/nginx/configuration.nix

@@ -62,7 +62,7 @@ in
       forceSSL = true;
       locations."/".extraConfig = ''
         add_header Content-Type 'text/html; charset=UTF-8';
-        return 200 meow;
+        return 200 '<h1>meow</h1>';
       '';
       locations."= /.well-known/matrix/client".extraConfig = mkWellKnown clientConfig;
       locations."= /.well-known/matrix/server".extraConfig = mkWellKnown serverConfig;

nixos/hosts/synapse/configuration.nix

@@ -6,6 +6,7 @@
 let
   vs = config.vault-secrets.secrets;
   port = 8008;
+  metricsPort = 9000;
 in
 {
   imports = [ ];
@@ -23,7 +24,7 @@ in
   # Additional packages
   environment.systemPackages = with pkgs; [ ];
 
-  networking.firewall.allowedTCPPorts = [ port ];
+  networking.firewall.allowedTCPPorts = [ port metricsPort ];
 
   vault-secrets.secrets.synapse = {
     user = "matrix-synapse";
@@ -65,6 +66,7 @@ in
           server_name = "meowy.tech";
           enable_registration = true;
           public_baseurl = "https://chat.meowy.tech";
+          enable_metrics = true;
           listeners = [
             {
               inherit port;
@@ -79,6 +81,18 @@ in
                 }
               ];
             }
+            {
+              port = metricsPort;
+              bind_addresses = [ "0.0.0.0" ];
+              type = "metrics";
+              tls = false;
+              resources = [
+                {
+                  names = [ "metrics" ];
+                  compress = false;
+                }
+              ];
+            }
           ];
         };
     };

nixos/hosts/victoriametrics/configuration.nix

@@ -6,7 +6,8 @@
 let
   vmPort = 8428;
   vs = config.vault-secrets.secrets;
-in {
+in
+{
   imports = [ ];
 
   networking.hostName = "victoriametrics";
@@ -32,7 +33,25 @@ in {
     retentionPeriod = 12;
   };
 
-  vault-secrets.secrets.grafana = { 
+  services.vmagent = {
+    enable = true;
+    openFirewall = true;
+    prometheusConfig = {
+      global.scrape_interval = "5s";
+      scrape_configs = [
+        {
+          job_name = "synapse";
+          metrics_path = "/_synapse/metrics";
+          static_configs = [{
+            targets = [ "synapse.olympus:9000" ];
+            labels.app = "synapse";
+          }];
+        }
+      ];
+    };
+  };
+
+  vault-secrets.secrets.grafana = {
     user = "grafana";
     group = "grafana";
   };