ildkule/grafana: add dashboard for php-fpm

hosts/bekkalokk/configuration.nix

@@ -13,6 +13,7 @@
     ./services/mediawiki
     ./services/nginx.nix
     ./services/phpfpm.nix
+    ./services/prometheus-phpfpm-exporter.nix
     ./services/vaultwarden.nix
     ./services/webmail
     ./services/website

hosts/bekkalokk/services/prometheus-phpfpm-exporter.nix

@@ -0,0 +1,49 @@
+{ config, lib, values, ... }:
+let
+  cfg = config.services.prometheus.exporters.php-fpm;
+  pools = [
+    "idp"
+    "mediawiki"
+    "pvv-nettsiden"
+    "roundcube"
+    "snappymail"
+  ];
+in
+{
+  services.phpfpm.pools = lib.genAttrs pools (_: {
+    settings."pm.status_path" = "/status";
+  });
+
+  services.prometheus.exporters.php-fpm = {
+    enable = true;
+    listenAddress = "127.0.0.1";
+    extraFlags = map
+      (name: "--phpfpm.scrape-uri=unix://${config.services.phpfpm.pools.${name}.socket};/status")
+      pools;
+  };
+
+  systemd.services.prometheus-php-fpm-exporter.serviceConfig = {
+    Slice = "system-monitoring.slice";
+    SupplementaryGroups = [ config.services.nginx.group ];
+  };
+
+  services.nginx = lib.mkIf cfg.enable {
+    virtualHosts."www.pvv.ntnu.no" = lib.mkIf config.services.nginx.enable {
+      forceSSL = true;
+      enableACME = true;
+      kTLS = true;
+
+      locations."/prometheus-php-fpm-exporter/metrics" = {
+        proxyPass = "http://localhost:${toString cfg.port}/metrics";
+
+        extraConfig = ''
+          allow 127.0.0.1;
+          allow ::1;
+          allow ${values.hosts.ildkule.ipv4};
+          allow ${values.hosts.ildkule.ipv6};
+          deny all;
+        '';
+      };
+    };
+  };
+}

hosts/ildkule/services/monitoring/grafana.nix

@@ -68,6 +68,12 @@ in {
           url = "https://grafana.com/api/dashboards/9628/revisions/8/download";
           options.path = dashboards/postgres.json;
         }
+        {
+          name = "PHP-FPM";
+          type = "file";
+          url = "https://grafana.com/api/dashboards/25149/revisions/1/download";
+          options.path = dashboards/php-fpm.json;
+        }
         {
           name = "Gitea Dashboard";
           type = "file";

hosts/ildkule/services/monitoring/prometheus/default.nix

@@ -7,6 +7,7 @@ in {
     ./machines.nix
     ./matrix-synapse.nix
     ./mysqld.nix
+    ./phpfpm.nix
     ./postgres.nix
   ];
 

hosts/ildkule/services/monitoring/prometheus/phpfpm.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  services.prometheus.scrapeConfigs = [{
+    job_name = "phpfpm";
+    scheme = "https";
+    metrics_path = "/prometheus-php-fpm-exporter/metrics";
+
+    static_configs = [
+      {
+        labels.hostname = "bekkalokk";
+        targets = [ "www.pvv.ntnu.no:443" ];
+      }
+    ];
+  }];
+}