add phpfpm prometheus exporter

docs/redirects.json

@@ -1418,6 +1418,15 @@
   "services-nextcloudserver-options-shb.nextcloud.phpFpmPoolSettings": [
     "services-nextcloud.html#services-nextcloudserver-options-shb.nextcloud.phpFpmPoolSettings"
   ],
+  "services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter": [
+    "services-nextcloud.html#services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter"
+  ],
+  "services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter.enable": [
+    "services-nextcloud.html#services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter.enable"
+  ],
+  "services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter.port": [
+    "services-nextcloud.html#services-nextcloudserver-options-shb.nextcloud.phpFpmPrometheusExporter.port"
+  ],
   "services-nextcloudserver-options-shb.nextcloud.port": [
     "services-nextcloud.html#services-nextcloudserver-options-shb.nextcloud.port"
   ],

modules/services/nextcloud-server.nix

@@ -183,6 +183,27 @@ in
       '';
     };
 
+    phpFpmPrometheusExporter = lib.mkOption {
+      description = "Settings for exporting";
+      default = {};
+
+      type = lib.types.submodule {
+        options = {
+          enable = lib.mkOption {
+            description = "Enable export of php-fpm metrics to Prometheus.";
+            type = lib.types.bool;
+            default = true;
+          };
+
+          port = lib.mkOption {
+            description = "Port on which the exporter will listen.";
+            type = lib.types.port;
+            default = 8300;
+          };
+        };
+      };
+    };
+
     apps = lib.mkOption {
       description = ''
         Applications to enable in Nextcloud. Enabling an application here will also configure
@@ -749,6 +770,27 @@ in
       systemd.services.nextcloud-setup.after = cfg.mountPointServices;
     })
 
+    (lib.mkIf cfg.phpFpmPrometheusExporter.enable {
+      services.prometheus.exporters.php-fpm = {
+        enable = true;
+        user = "nginx";
+        port = cfg.phpFpmPrometheusExporter.port;
+        listenAddress = "127.0.0.1";
+        environmentFile = pkgs.writeText "phpFpmExporterEnvFiles" ''
+        PHP_FPM_SCRAPE_URI=unix://${config.services.phpfpm.pools.nextcloud.socket}
+        '';
+      };
+
+      services.prometheus.scrapeConfigs = [
+        {
+          job_name = "phpfpm-nextcloud";
+          static_configs = [{
+            targets = ["127.0.0.1:${toString cfg.phpFpmPrometheusExporter.port}"];
+          }];
+        }
+      ];
+    })
+
     (lib.mkIf (cfg.enable && cfg.apps.onlyoffice.enable) {
       assertions = [
         {

test/services/nextcloud.nix

@@ -217,6 +217,24 @@ let
       };
     };
   };
+
+  prometheus = { config, ... }: {
+    shb.nextcloud = {
+      phpFpmPrometheusExporter.enable = true;
+    };
+  };
+
+  prometheusTestScript = { nodes, ... }:
+    ''
+    server.wait_for_open_unix_socket("${nodes.server.services.phpfpm.pools.nextcloud.socket}")
+    server.wait_for_open_port(${toString nodes.server.services.prometheus.exporters.php-fpm.port})
+    with subtest("prometheus"):
+        response = server.succeed(
+            "curl -sSf "
+            + " http://localhost:${toString nodes.server.services.prometheus.exporters.php-fpm.port}/metrics"
+        )
+        print(response)
+    '';
 in
 {
   basic = pkgs.testers.runNixOSTest {
@@ -343,4 +361,20 @@ in
   
     testScript = commonTestScript.access;
   };
+
+  prometheus = pkgs.testers.runNixOSTest {
+    name = "nextcloud_prometheus";
+
+    nodes.server = { config, ... }: {
+      imports = [
+        base
+        basic
+        prometheus
+      ];
+    };
+
+    nodes.client = {};
+
+    testScript = prometheusTestScript;
+  };
 }