comin: Scrape metrics with alloy

modules/nixos/services/alloy.nix

@@ -109,6 +109,20 @@ in
             }
           '';
         };
+        "alloy/comin-metrics.alloy" = {
+          enable = cfg.collect.metrics.comin;
+          text = ''
+            prometheus.scrape "comin" {
+              targets = [{
+                __address__ = "localhost:${toString config.custom.services.comin.metricsPort}",
+                job = "comin",
+                instance = constants.hostname,
+              }]
+              forward_to = [prometheus.remote_write.default.receiver]
+              scrape_interval = "30s"
+            }
+          '';
+        };
       };
 
     custom.services.caddy.virtualHosts.${cfg.domain}.port = cfg.port;

modules/nixos/services/comin.nix

@@ -4,12 +4,21 @@
   lib,
   ...
 }:
+let
+  cfg = config.custom.services.comin;
+in
 {
   imports = [ inputs.comin.nixosModules.comin ];
 
-  options.custom.services.comin.enable = lib.mkEnableOption "";
+  options.custom.services.comin = {
+    enable = lib.mkEnableOption "";
+    metricsPort = lib.mkOption {
+      type = lib.types.port;
+      default = 4243;
+    };
+  };
 
-  config = lib.mkIf config.custom.services.comin.enable {
+  config = lib.mkIf cfg.enable {
     services.comin = {
       enable = true;
       remotes = lib.singleton {
@@ -18,5 +27,9 @@
         branches.main.name = "deploy";
       };
     };
+    exporter = {
+      listen_address = "127.0.0.1";
+      inherit (cfg) port;
+    };
   };
 }