grafana/module.nix: fix datasources

hosts/tower/configuration.nix

@@ -36,6 +36,7 @@
       services = {
         forgejo.enable = true;
         grafana.enable = true;
+        prometheus.enable = true;
       };
       programs = {
         editors = {

modules/services/grafana/module.nix

@@ -50,19 +50,19 @@ in {
         enable = true;
         datasources.settings = {
           datasources = [
-            (mkIf config.modules.system.services.database.postgresql.enable {
+            (mkIf config.modules.system.services.prometheus.enable {
               name = "Prometheus";
               type = "prometheus";
               access = "proxy";
-              url = "http://127.0.0.1:4024";
+              url = "http://127.0.0.1:${toString config.services.prometheus.port}";
               isDefault = true;
             })
 
-            (mkIf config.modules.system.services.prometheus.enable {
+            (mkIf config.modules.system.services.database.postgresql.enable {
               name = "PostgreSQL";
               type = "postgres";
               access = "proxy";
-              url = "http://127.0.0.1:${toString config.services.prometheus.port}";
+              url = "http://127.0.0.1:${toString config.services.prometheus.exporters.postgres.port}";
             })
           ];
         };

modules/services/prometheus/module.nix

@@ -7,7 +7,7 @@
   inherit (lib.modules) mkIf;
   inherit (lib.options) mkEnableOption;
 
-  cfg = config.modules.system.services.grafana;
+  cfg = config.modules.system.services.prometheus;
   port = 4022;
 in {
   options.modules.system.services.prometheus.enable = mkEnableOption "Grafana, a graphing service";