servo: add munin for monitoring/metrics

this is especially useful for `coredumpctl`.
maybe useful enough that it should be in `environment.systemPackages`...

machines/servo/services/default.nix

@@ -8,6 +8,7 @@
     ./jackett.nix
     ./jellyfin.nix
     ./matrix
+    ./munin.nix
     ./navidrome.nix
     ./nginx.nix
     ./pleroma.nix

machines/servo/services/munin.nix

@@ -0,0 +1,12 @@
+{ config, ... }:
+{
+  services.munin-node.enable = true;
+  services.munin-cron = {
+    enable = true;
+    # collect data from the localhost
+    hosts = ''
+      [${config.networking.hostName}]
+      address localhost
+    '';
+  };
+}

machines/servo/services/nginx.nix

@@ -57,6 +57,13 @@
     # };
   };
 
+  # server statistics
+  services.nginx.virtualHosts."sink.uninsane.org" = {
+    addSSL = true;
+    enableACME = true;
+    root = "/var/www/munin";
+  };
+
   # Pleroma server and web interface
   services.nginx.virtualHosts."fed.uninsane.org" = {
     addSSL = true;

modules/universal/env/home-packages.nix

@@ -161,6 +161,7 @@ let
     dtc
     flex
     gcc
+    gdb
     # gcc-arm-embedded
     # gcc_multi
     gnumake