nixos/chronos: remove module

The chronos package has been broken for > 9 months due to the breakage
of the mesos package.

nixos/modules/misc/ids.nix

@@ -198,7 +198,7 @@ in
       bosun = 161;
       kubernetes = 162;
       peerflix = 163;
-      chronos = 164;
+      #chronos = 164; # removed 2020-08-15
       gitlab = 165;
       tox-bootstrapd = 166;
       cadvisor = 167;

nixos/modules/module-list.nix

@@ -784,7 +784,6 @@
   ./services/networking/znc/default.nix
   ./services/printing/cupsd.nix
   ./services/scheduling/atd.nix
-  ./services/scheduling/chronos.nix
   ./services/scheduling/cron.nix
   ./services/scheduling/fcron.nix
   ./services/scheduling/marathon.nix

nixos/modules/rename.nix

@@ -17,6 +17,7 @@ with lib;
     (mkAliasOptionModule [ "environment" "checkConfigurationOptions" ] [ "_module" "check" ])
 
     # Completely removed modules
+    (mkRemovedOptionModule [ "services" "chronos" ] "The corresponding package was removed from nixpkgs.")
     (mkRemovedOptionModule [ "services" "firefox" "syncserver" "user" ] "")
     (mkRemovedOptionModule [ "services" "firefox" "syncserver" "group" ] "")
     (mkRemovedOptionModule [ "services" "mesos" ] "The corresponding package was removed from nixpkgs.")

nixos/modules/services/scheduling/chronos.nix

@@ -1,54 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-let
-  cfg = config.services.chronos;
-
-in {
-
-  ###### interface
-
-  options.services.chronos = {
-    enable = mkOption {
-      description = "Whether to enable graphite web frontend.";
-      default = false;
-      type = types.bool;
-    };
-
-    httpPort = mkOption {
-      description = "Chronos listening port";
-      default = 4400;
-      type = types.int;
-    };
-
-    master = mkOption {
-      description = "Chronos mesos master zookeeper address";
-      default = "zk://${head cfg.zookeeperHosts}/mesos";
-      type = types.str;
-    };
-
-    zookeeperHosts = mkOption {
-      description = "Chronos mesos zookepper addresses";
-      default = [ "localhost:2181" ];
-      type = types.listOf types.str;
-    };
-  };
-
-  ###### implementation
-
-  config = mkIf cfg.enable {
-    systemd.services.chronos = {
-      description = "Chronos Service";
-      wantedBy = [ "multi-user.target" ];
-      after = [ "network.target" "zookeeper.service" ];
-
-      serviceConfig = {
-        ExecStart = "${pkgs.chronos}/bin/chronos --master ${cfg.master} --zk_hosts ${concatStringsSep "," cfg.zookeeperHosts} --http_port ${toString cfg.httpPort}";
-        User = "chronos";
-      };
-    };
-
-    users.users.chronos.uid = config.ids.uids.chronos;
-  };
-}