nixos/prometheus-mongodb-exporter: init module

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

@@ -50,6 +50,7 @@ let
     "mikrotik"
     "minio"
     "modemmanager"
+    "mongodb"
     "mysqld"
     "nextcloud"
     "nginx"

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

@@ -0,0 +1,68 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.mongodb;
+in
+{
+  port = 9216;
+  extraOpts = {
+    uri = mkOption {
+      type = types.str;
+      default = "mongodb://localhost:27017/test";
+      example = "mongodb://localhost:27017/test";
+      description = lib.mdDoc "MongoDB URI to connect to.";
+    };
+    collStats = mkOption {
+      type = types.listOf types.str;
+      default = [ ];
+      example = [ "db1.coll1" "db2" ];
+      description = lib.mdDoc ''
+        List of comma separared databases.collections to get $collStats
+      '';
+    };
+    indexStats = mkOption {
+      type = types.listOf types.str;
+      default = [ ];
+      example = [ "db1.coll1" "db2" ];
+      description = lib.mdDoc ''
+        List of comma separared databases.collections to get $indexStats
+      '';
+    };
+    collector = mkOption {
+      type = types.listOf types.str;
+      default = [ ];
+      example = [ "diagnosticdata" "replicasetstatus" "dbstats" "topmetrics" "currentopmetrics" "indexstats" "dbstats" "profile" ];
+      description = lib.mdDoc "Enabled collectors";
+    };
+    collectAll = mkOption {
+      type = types.bool;
+      default = false;
+      description = lib.mdDoc ''
+        Enable all collectors. Same as specifying all --collector.<name>
+      '';
+    };
+    telemetryPath = mkOption {
+      type = types.str;
+      default = "/metrics";
+      example = "/metrics";
+      description = lib.mdDoc "Metrics expose path";
+    };
+  };
+  serviceOpts = {
+    serviceConfig = {
+      RuntimeDirectory = "prometheus-mongodb-exporter";
+      ExecStart = ''
+        ${getExe pkgs.prometheus-mongodb-exporter} \
+          --mongodb.uri=${cfg.uri}
+          ${if cfg.collectAll then "--collect-all" else concatMapStringsSep " " (x: "--collect.${x}") cfg.collector} \
+          --collector.collstats=${concatStringsSep "," cfg.collStats} \
+          --collector.indexstats=${concatStringsSep "," cfg.indexStats} \
+          --web.listen-address=${cfg.listenAddress}:${toString cfg.port} \
+          --web.telemetry-path=${cfg.telemetryPath} \
+          ${escapeShellArgs cfg.extraFlags}
+      '';
+    };
+  };
+}