modules/monitoring: add loki and promtail

modules/nixos/common-settings/mainland.nix

@@ -0,0 +1,38 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  inherit (lib)
+    mkIf
+    mkOption
+    types
+    mkDefault
+    ;
+
+  cfg = config.inMainland;
+in
+{
+  options.inMainland = mkOption {
+    type = types.bool;
+    default = config.time.timeZone == "Asia/Shanghai";
+  };
+
+  config = mkIf cfg {
+    nix.settings.extra-substituters = [
+      "https://mirrors.cernet.edu.cn/nix-channels/store?priority=20"
+    ];
+
+    networking.timeServers = [
+      "cn.ntp.org.cn"
+      "ntp.ntsc.ac.cn"
+    ];
+
+    services.dae = {
+      enable = mkDefault true;
+    };
+  };
+}

modules/nixos/common-settings/nix-conf.nix

@@ -21,7 +21,6 @@ in
       default = true;
       type = types.bool;
     };
-    enableMirrors = mkEnableOption "cache.nixos.org mirrors in Mainland China";
     signing = {
       enable = mkEnableOption "Sign locally-built paths";
       keyFile = mkOption {
@@ -55,10 +54,6 @@ in
         "https://cache.garnix.io"
       ];
 
-      extra-substituters = mkIf cfg.enableMirrors [
-        "https://mirrors.cernet.edu.cn/nix-channels/store?priority=20"
-      ];
-
       trusted-public-keys = [
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
         "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="

modules/nixos/common-settings/proxy-server.nix

@@ -9,8 +9,6 @@ let
     mkIf
     mkEnableOption
     mkOption
-    mkDefault
-    types
     ;
 
   cfg = config.commonSettings.proxyServer;
@@ -26,6 +24,9 @@ let
   mkSingConfig =
     { uuid, password, ... }:
     {
+      log = {
+        level = "warn";
+      };
       inbounds =
         [
           {