prometheus-openldap-exporter: remove

2.3.0 is the final release, the repo is now archived.

Also I don't use it anymore for quite a while, so it didn't have a real
nixpkgs maintainer either.

Closes #338712

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

@@ -63,7 +63,6 @@ let
     "nginxlog"
     "node"
     "nut"
-    "openldap"
     "pgbouncer"
     "php-fpm"
     "pihole"

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

@@ -1,66 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-let
-  cfg = config.services.prometheus.exporters.openldap;
-  inherit (lib) mkOption types concatStringsSep;
-in {
-  port = 9330;
-  extraOpts = {
-    ldapCredentialFile = mkOption {
-      type = types.path;
-      example = "/run/keys/ldap_pass";
-      description = ''
-        Environment file to contain the credentials to authenticate against
-        `openldap`.
-
-        The file should look like this:
-        ```
-        ---
-        ldapUser: "cn=monitoring,cn=Monitor"
-        ldapPass: "secret"
-        ```
-      '';
-    };
-    protocol = mkOption {
-      default = "tcp";
-      example = "udp";
-      type = types.str;
-      description = ''
-        Which protocol to use to connect against `openldap`.
-      '';
-    };
-    ldapAddr = mkOption {
-      default = "localhost:389";
-      type = types.str;
-      description = ''
-        Address of the `openldap`-instance.
-      '';
-    };
-    metricsPath = mkOption {
-      default = "/metrics";
-      type = types.str;
-      description = ''
-        URL path where metrics should be exposed.
-      '';
-    };
-    interval = mkOption {
-      default = "30s";
-      type = types.str;
-      example = "1m";
-      description = ''
-        Scrape interval of the exporter.
-      '';
-    };
-  };
-  serviceOpts.serviceConfig = {
-    ExecStart = ''
-      ${pkgs.prometheus-openldap-exporter}/bin/openldap_exporter \
-        --promAddr ${cfg.listenAddress}:${toString cfg.port} \
-        --metrPath ${cfg.metricsPath} \
-        --ldapNet ${cfg.protocol} \
-        --interval ${cfg.interval} \
-        --config ${cfg.ldapCredentialFile} \
-        ${concatStringsSep " \\\n  " cfg.extraFlags}
-    '';
-  };
-}