add prometheus to hydra

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

systems/palatine-hill/hydra.nix

@@ -53,6 +53,12 @@
           timeout = 3600
         </git-input>
         Include ${config.sops.secrets."alice/gha-hydra-token".path}
+        <hydra_notify>
+          <prometheus>
+            listen_address = 127.0.0.1
+            port = 9199
+          </prometheus>
+        </hydra_notify>
       '';
     };
 
@@ -60,6 +66,20 @@
       enable = true;
       secretKeyFile = config.sops.secrets."nix-serve/secret-key".path;
     };
+    prometheus = {
+      enable = true;
+      exporters.node = {
+        enable = true;
+        enabledCollectors = [ "systemd" ];
+        port = 9002;
+      };
+      scrapeConfigs = [
+        {
+          job_name = "hydra";
+          static_configs = [ { targets = [ "127.0.0.1:9199" ]; } ];
+        }
+      ];
+    };
   };
 
   users.users.root.openssh.authorizedKeys.keys = [