refactor(ops): make status.snix.dev grafana listen on unix socket

Change-Id: Ib3838edf1ee98a8fe1792771f1a948f00e3f466b
Reviewed-on: https://cl.snix.dev/c/snix/+/30493
Reviewed-by: Ryan Lahfa <masterancpp@gmail.com>
Autosubmit: Florian Klink <flokli@flokli.de>
Tested-by: besadii

ops/modules/o11y/grafana.nix

@@ -17,9 +17,10 @@ in
 
         settings = {
           server = {
+            protocol = "socket";
+            socket = "/run/grafana/web.sock";
+            socket_gid = config.ids.gids.nginx;
             domain = "status.snix.dev";
-            http_addr = "127.0.0.1";
-            http_port = 2342;
             root_url = "https://status.snix.dev/";
           };
 
@@ -140,6 +141,9 @@ in
       };
     };
 
+    systemd.services.grafana.serviceConfig.RuntimeDirectory = "grafana";
+    systemd.services.grafana.serviceConfig.SupplementaryGroups = "nginx";
+
     infra.monitoring.alloy.exporters.grafana.port = 2342;
   };
 }

ops/modules/www/status.snix.dev.nix

@@ -1,4 +1,4 @@
-{ config, ... }:
+{ ... }:
 
 {
   imports = [
@@ -6,17 +6,14 @@
   ];
 
   config = {
-    services.nginx =
-      let
-        scfg = config.services.grafana.settings.server;
-      in
-      {
+    services.nginx = {
       enable = true;
-        virtualHosts."${scfg.domain}" = {
+      upstreams.grafana.servers."unix:/run/grafana/web.sock" = { };
+      virtualHosts."status.snix.dev" = {
         enableACME = true;
         forceSSL = true;
         locations."/" = {
-            proxyPass = "http://${scfg.http_addr}:${toString scfg.http_port}";
+          proxyPass = "http://grafana/";
           proxyWebsockets = true;
         };
       };