Remove the monitoring module

This module is broken since years (pid file locations is not correct)
and nobody fixed it.

default.nix

@@ -725,65 +725,6 @@ in
       '';
     };
 
-    monitoring = {
-      enable = mkEnableOption "monitoring via monit";
-
-      alertAddress = mkOption {
-        type = types.str;
-        description = ''
-          The email address to send alerts to.
-        '';
-      };
-
-      config = mkOption {
-        type = types.str;
-        default = ''
-          set daemon 120 with start delay 60
-          set mailserver
-              localhost
-
-          set httpd port 2812 and use address localhost
-              allow localhost
-              allow admin:obwjoawijerfoijsiwfj29jf2f2jd
-
-          check filesystem root with path /
-                if space usage > 80% then alert
-                if inode usage > 80% then alert
-
-          check system $HOST
-                if cpu usage > 95% for 10 cycles then alert
-                if memory usage > 75% for 5 cycles then alert
-                if swap usage > 20% for 10 cycles then alert
-                if loadavg (1min) > 90 for 15 cycles then alert
-                if loadavg (5min) > 80 for 10 cycles then alert
-                if loadavg (15min) > 70 for 8 cycles then alert
-
-          check process sshd with pidfile /var/run/sshd.pid
-                start program  "${pkgs.systemd}/bin/systemctl start sshd"
-                stop program  "${pkgs.systemd}/bin/systemctl stop sshd"
-                if failed port 22 protocol ssh for 2 cycles then restart
-
-          check process postfix with pidfile /var/lib/postfix/queue/pid/master.pid
-                start program = "${pkgs.systemd}/bin/systemctl start postfix"
-                stop program = "${pkgs.systemd}/bin/systemctl stop postfix"
-                if failed port 25 protocol smtp for 5 cycles then restart
-
-          check process dovecot with pidfile /var/run/dovecot2/master.pid
-                start program = "${pkgs.systemd}/bin/systemctl start dovecot2"
-                stop program = "${pkgs.systemd}/bin/systemctl stop dovecot2"
-                if failed host ${cfg.fqdn} port 993 type tcpssl sslauto protocol imap for 5 cycles then restart
-
-          check process rspamd with pidfile /var/run/rspamd.pid
-                start program = "${pkgs.systemd}/bin/systemctl start rspamd"
-                stop program = "${pkgs.systemd}/bin/systemctl stop rspamd"
-        '';
-        description = ''
-          The configuration used for monitoring via monit.
-          Use a mail address that you actively check and set it via 'set alert ...'.
-        '';
-      };
-    };
-
     borgbackup = {
       enable = mkEnableOption "backup via borgbackup";
 

mail-server/monit.nix

@@ -1,32 +0,0 @@
-#  nixos-mailserver: a simple mail server
-#  Copyright (C) 2016-2018  Robin Raymond
-#
-#  This program is free software: you can redistribute it and/or modify
-#  it under the terms of the GNU General Public License as published by
-#  the Free Software Foundation, either version 3 of the License, or
-#  (at your option) any later version.
-#
-#  This program is distributed in the hope that it will be useful,
-#  but WITHOUT ANY WARRANTY; without even the implied warranty of
-#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#  GNU General Public License for more details.
-#
-#  You should have received a copy of the GNU General Public License
-#  along with this program. If not, see <http://www.gnu.org/licenses/>
-
-{ config, pkgs, lib, ... }:
-
-let
-  cfg = config.mailserver;
-in
-{
-  config = lib.mkIf (cfg.enable && cfg.monitoring.enable) {
-    services.monit = {
-      enable = true;
-      config = ''
-        set alert ${cfg.monitoring.alertAddress}
-        ${cfg.monitoring.config}
-      '';
-    };
-  };
-}