update

modules/services/monitoring.nix

@@ -2,18 +2,16 @@
   pkgs,
   lib,
   config,
-  instanceConfig,
-  instanceConfigs,
-  # inputs,
+  otherNodes,
   ...
 }:
 with lib;
 let
   cfg = config.xyno.services.monitoring;
 
-  firstInstanceWithPromServer = (builtins.head (
-    builtins.filter (x: x ? prometheusServer && x.prometheusServer) (attrValues instanceConfigs)
-  )).hostName;
+  firstInstanceWithPromServer = if cfg.prometheusServer then config.networking.hostName else (builtins.head (
+    attrValues (filterAttrs (n: v: v.config.xyno.services.monitoring.prometheusServer) (otherNodes))
+  )).config.networking.hostName;
   vmBasicAuthUsername = "xyno-monitoring";
 in
 {
@@ -24,6 +22,10 @@ in
     default = "http://${firstInstanceWithPromServer}.${config.xyno.services.wireguard.monHostsDomain}:8428/api/v1/write";
     description = "where prometheus metrics should be pushed to";
   };
+  options.xyno.services.monitoring.prometheusServer = mkOption {
+    type = types.bool;
+    default = false;
+  };
   options.xyno.services.monitoring.exporters = mkOption {
     type = types.attrsOf (types.either types.int types.str);
     description = "names of exporters and their ports (to open fw and generate prometheus config)";
@@ -64,7 +66,7 @@ in
       };
 
     })
-    (mkIf (cfg.enable && instanceConfig ? prometheusServer && instanceConfig.prometheusServer) {
+    (mkIf (cfg.enable && cfg.prometheusServer) {
       xyno.impermanence.directories = [ "/var/lib/${config.services.victoriametrics.stateDir}" ];
       sops.secrets."victoriametrics/basicAuthPassword" = {
         reloadUnits = [ "victoriametrics.service" ];