1 files changed, 88 insertions, 0 deletions
diff --git a/modules/alertmanager.nix b/modules/alertmanager.nix
new file mode 100644
index 0000000..a3457bc
--- /dev/null
+++ b/modules/alertmanager.nix
@@ -0,0 +1,88 @@
+{
+  config,
+  inputs,
+  lib,
+  libNginx,
+  ...
+}:
+with lib;
+let
+  cfg = config.nixfiles.modules.alertmanager;
+in
+{
+  imports = [ inputs.alertmanager-ntfy.nixosModules.default ];
+
+  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.${config.networking.domain}";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    nixfiles.modules = {
+      ntfy.enable = true;
+      nginx = {
+        enable = true;
+        upstreams.alertmanager.servers."127.0.0.1:${toString cfg.port}" = { };
+        virtualHosts.${cfg.domain} = {
+          locations."/".proxyPass = "http://alertmanager";
+          extraConfig = libNginx.config.internalOnly;
+        };
+      };
+    };
+
+    services = {
+      prometheus.alertmanager = {
+        enable = true;
+
+        listenAddress = "127.0.0.1";
+        inherit (cfg) port;
+
+        extraFlags = [
+          "--cluster.listen-address=\"\""
+          "--web.external-url=https://${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;
+              webhook_configs = [
+                { url = with config.services.alertmanager-ntfy; "http://${httpAddress}:${httpPort}"; }
+              ];
+            }
+          ];
+        };
+      };
+    };
+
+    services.alertmanager-ntfy = {
+      enable = true;
+      httpAddress = "127.0.0.1";
+      httpPort = toString (config.nixfiles.modules.ntfy.port + 1);
+      ntfyTopic = "${config.services.ntfy-sh.settings.base-url}/alertmanager";
+      ntfyPriority = "high";
+      envFile = "/dev/null";
+    };
+  };
+}