system/docker: enable monitoring

modules/system/docker/default.nix

@@ -18,5 +18,33 @@ in
       enable = true;
       autoPrune.enable = true;
     };
+
+    services.cadvisor.enable = config.services.prometheus.enable;
+
+    services.prometheus = {
+      scrapeConfigs = [
+        {
+          job_name = "docker";
+          static_configs = [
+            {
+              targets = [ "127.0.0.1:${toString config.services.cadvisor.port}" ];
+              labels = {
+                instance = config.networking.hostName;
+              };
+            }
+          ];
+        }
+      ];
+    };
+    # dashboard untested
+    services.grafana.provision = {
+      dashboards.settings.providers = [
+        {
+          name = "Docker";
+          options.path = pkgs.grafana-dashboards.cadvisor;
+          disableDeletion = true;
+        }
+      ];
+    };
   };
 }

pkgs/grafana-dashboards/default.nix

@@ -67,6 +67,13 @@ in
     src = ./navidrome.json; # sadly data source is not detected
   });
 
+  cadvisor = buildGrafanaDashboard {
+    id = 10619;
+    pname = "cadvisor";
+    version = "1";
+    hash = "sha256-T1HqWbwt+i/Wa+Y2B7hclaCijGxZF5QI38aPcXjk9y0=";
+  };
+
   loki = (buildGrafanaDashboard {
     id = 13407;
     pname = "loki";