nixos/prometheus-apcupsd-exporter: new module

Signed-off-by: Matt Layher <mdlayher@gmail.com>

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

@@ -21,6 +21,7 @@ let
   #  `serviceOpts.script` or `serviceOpts.serviceConfig.ExecStart`
 
   exporterOpts = genAttrs [
+    "apcupsd"
     "bind"
     "blackbox"
     "collectd"

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

@@ -0,0 +1,38 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.apcupsd;
+in
+{
+  port = 9162;
+  extraOpts = {
+    apcupsdAddress = mkOption {
+      type = types.str;
+      default = ":3551";
+      description = ''
+        Address of the apcupsd Network Information Server (NIS).
+      '';
+    };
+
+    apcupsdNetwork = mkOption {
+      type = types.enum ["tcp" "tcp4" "tcp6"];
+      default = "tcp";
+      description = ''
+        Network of the apcupsd Network Information Server (NIS): one of "tcp", "tcp4", or "tcp6".
+      '';
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.prometheus-apcupsd-exporter}/bin/apcupsd_exporter \
+          -telemetry.addr ${cfg.listenAddress}:${toString cfg.port} \
+          -apcupsd.addr ${cfg.apcupsdAddress} \
+          -apcupsd.network ${cfg.apcupsdNetwork} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}
+      '';
+    };
+  };
+}

nixos/tests/prometheus-exporters.nix

@@ -56,6 +56,21 @@ let
  */
 
   exporterTests = {
+     apcupsd = {
+      exporterConfig = {
+        enable = true;
+      };
+      metricProvider = {
+        services.apcupsd.enable = true;
+      };
+      exporterTest = ''
+        wait_for_unit("apcupsd.service")
+        wait_for_open_port(3551)
+        wait_for_unit("prometheus-apcupsd-exporter.service")
+        wait_for_open_port(9162)
+        succeed("curl -sSf http://localhost:9162/metrics | grep -q 'apcupsd_info'")
+      '';
+    };
 
     bind = {
       exporterConfig = {