services.prometheus.exporters.statsd: init service

nixos/modules/services/monitoring/prometheus/exporters.nix

@@ -66,6 +66,7 @@ let
     "smartctl"
     "smokeping"
     "sql"
+    "statsd"
     "surfboard"
     "systemd"
     "tor"

nixos/modules/services/monitoring/prometheus/exporters/statsd.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.statsd;
+in
+{
+  port = 9102;
+  serviceOpts = {
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.prometheus-statsd-exporter}/bin/statsd_exporter \
+          --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}
+      '';
+    };
+  };
+}

nixos/tests/prometheus-exporters.nix

@@ -1151,6 +1151,25 @@ let
       '';
     };
 
+    statsd = {
+      exporterConfig = {
+        enable = true;
+      };
+      exporterTest = ''
+        wait_for_unit("prometheus-statsd-exporter.service")
+        wait_for_open_port(9102)
+        succeed("curl http://localhost:9102/metrics | grep 'statsd_exporter_build_info{'")
+        succeed(
+          "echo 'test.udp:1|c' > /dev/udp/localhost/9125",
+          "curl http://localhost:9102/metrics | grep 'test_udp 1'",
+        )
+        succeed(
+          "echo 'test.tcp:1|c' > /dev/tcp/localhost/9125",
+          "curl http://localhost:9102/metrics | grep 'test_tcp 1'",
+        )
+      '';
+    };
+
     surfboard = {
       exporterConfig = {
         enable = true;