change metrics server hostname

hosts/oracle/default.nix

@@ -21,6 +21,7 @@ nixpkgs.lib.nixosSystem {
       streamServer = "stream.masu.rs";
       nextcloudServer = "cloud.masu.rs";
       transmissionServer = "download.masu.rs";
+      metricsServer = "metrics.masu.rs";
 
       # Disable passwords, only use SSH key
       passwordHash = null;

modules/services/prometheus.nix

@@ -3,7 +3,6 @@
   options.metricsServer = lib.mkOption {
     type = lib.types.str;
     description = "Hostname of the Grafana server.";
-    default = "grafana.masu.rs";
   };
 
   config = {