2022-12-17

1 files changed, 63 insertions, 0 deletions

diff --git a/modules/nixos/alertmanager.nix b/modules/nixos/alertmanager.nix
new file mode 100644
index 0000000..871b0c4
--- /dev/null
+++ b/modules/nixos/alertmanager.nix
@@ -0,0 +1,63 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.nixfiles.modules.alertmanager;
+in {
+  options.nixfiles.modules.alertmanager = {
+    enable = mkEnableOption "Alertmanager";
+
+    port = mkOption {
+      description = "Port.";
+      type = with types; port;
+      default = 30112;
+    };
+
+    domain = mkOption {
+      description = "Domain name sans protocol scheme.";
+      type = with types; nullOr str;
+      default = "alertmanager.${config.networking.domain}";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    nixfiles.modules.nginx = with cfg; {
+      enable = true;
+      upstreams.alertmanager.servers."127.0.0.1:${toString cfg.port}" = {};
+      virtualHosts.${cfg.domain} = {
+        locations."/".proxyPass = "http://alertmanager";
+        extraConfig = nginxInternalOnly;
+      };
+    };
+
+    services.prometheus.alertmanager = {
+      enable = true;
+
+      listenAddress = "127.0.0.1";
+      inherit (cfg) port;
+
+      extraFlags = ["--web.external-url=https://${cfg.domain}"];
+
+      configuration = {
+        global = {
+          smtp_from = "alertmanager@${my.domain.shire}";
+          smtp_smarthost = "${my.domain.shire}:584";
+        };
+
+        route = {
+          receiver = my.username;
+          group_by = ["alertname"];
+        };
+
+        receivers = [
+          {
+            name = my.username;
+            email_configs = [{to = "${my.username}+alert@${my.domain.shire}";}];
+          }
+        ];
+      };
+    };
+  };
+}