diff --git a/hosts/12kingdoms-youko/homelab-services/monitoring/victoriametrics.nix b/hosts/12kingdoms-youko/homelab-services/monitoring/victoriametrics.nix
index 72d41826..61452f30 100644
--- a/hosts/12kingdoms-youko/homelab-services/monitoring/victoriametrics.nix
+++ b/hosts/12kingdoms-youko/homelab-services/monitoring/victoriametrics.nix
@@ -100,10 +100,12 @@ in
           params.ups = [ "homelab" ];
           static_configs = [
             {
-              targets = [ "${myvars.networking.hostsAddr.shushou.ipv4}:9199" ];
+              # same-host nut exporter bound to loopback (127.0.0.1:9199); the
+              # UPS moved to this host with the SSD swap
+              targets = [ "127.0.0.1:9199" ];
               labels.type = "app";
               labels.app = "nut";
-              labels.host = "shushou";
+              labels.host = "youko";
               labels.env = "homelab";
               labels.cluster = "homelab";
             }
diff --git a/hosts/12kingdoms-shushou/ups.nix b/hosts/12kingdoms-youko/ups.nix
similarity index 78%
rename from hosts/12kingdoms-shushou/ups.nix
rename to hosts/12kingdoms-youko/ups.nix
index ba538632..bc40f1f7 100644
--- a/hosts/12kingdoms-shushou/ups.nix
+++ b/hosts/12kingdoms-youko/ups.nix
@@ -1,13 +1,12 @@
-{ myvars, ... }:
-let
-  hostAddress = myvars.networking.hostsAddr.shushou.ipv4;
-in
+{ ... }:
 {
+  # The UPS (Cypress USB-to-serial, 0665:5161) is attached to this host, which is
+  # now the homelab core. Metrics only for now; coordinated shutdown of all
+  # homelab hosts is a separate feature.
   power.ups = {
     enable = true;
     mode = "standalone";
 
-    # Metrics only. Coordinated shutdown of all homelab hosts is a separate feature.
     upsmon = {
       enable = false;
       settings.POWERDOWNFLAG = null;
@@ -33,7 +32,7 @@ in
 
   services.prometheus.exporters.nut = {
     enable = true;
-    listenAddress = hostAddress;
+    listenAddress = "127.0.0.1";
     port = 9199;
     nutServer = "127.0.0.1";
 
diff --git a/outputs/x86_64-linux/tests/ups-metrics/expected.nix b/outputs/x86_64-linux/tests/ups-metrics/expected.nix
index dc98ffe4..9fde7995 100644
--- a/outputs/x86_64-linux/tests/ups-metrics/expected.nix
+++ b/outputs/x86_64-linux/tests/ups-metrics/expected.nix
@@ -18,7 +18,7 @@
 
   exporter = {
     enable = true;
-    listenAddress = "192.168.5.182";
+    listenAddress = "127.0.0.1";
     port = 9199;
     nutServer = "127.0.0.1";
     exportsAllNumericVariables = true;
@@ -32,11 +32,11 @@
     scrape_interval = "30s";
     metrics_path = "/ups_metrics";
     params.ups = [ "homelab" ];
-    target = "192.168.5.182:9199";
+    target = "127.0.0.1:9199";
     labels = {
       type = "app";
       app = "nut";
-      host = "shushou";
+      host = "youko";
       env = "homelab";
       cluster = "homelab";
     };
diff --git a/outputs/x86_64-linux/tests/ups-metrics/expr.nix b/outputs/x86_64-linux/tests/ups-metrics/expr.nix
index 125a5207..0f63e472 100644
--- a/outputs/x86_64-linux/tests/ups-metrics/expr.nix
+++ b/outputs/x86_64-linux/tests/ups-metrics/expr.nix
@@ -4,27 +4,28 @@
   ...
 }:
 let
-  shushou = outputs.nixosConfigurations.shushou.config;
-  aquamarine = outputs.nixosConfigurations.youko.config;
-  ups = shushou.power.ups.ups.homelab or { };
-  exporter = shushou.services.prometheus.exporters.nut;
+  # The UPS moved to youko with the SSD swap; the NUT daemons, the exporter, and
+  # the victoriametrics scrape job now all live on the same host.
+  youko = outputs.nixosConfigurations.youko.config;
+  ups = youko.power.ups.ups.homelab or { };
+  exporter = youko.services.prometheus.exporters.nut;
   exporterService =
-    shushou.systemd.services.prometheus-nut-exporter or {
+    youko.systemd.services.prometheus-nut-exporter or {
       after = [ ];
       requires = [ ];
     };
   scrapeJobs = builtins.filter (
     job: (job.job_name or "") == "nut-exporter-homelab-ups"
-  ) aquamarine.services.victoriametrics.prometheusConfig.scrape_configs;
+  ) youko.services.victoriametrics.prometheusConfig.scrape_configs;
   scrapeJob = if builtins.length scrapeJobs == 1 then builtins.head scrapeJobs else null;
 in
 {
   nut = {
-    enable = shushou.power.ups.enable;
-    mode = shushou.power.ups.mode;
-    upsmonEnable = shushou.power.ups.upsmon.enable;
-    killPowerEnable = shushou.systemd.services.ups-killpower.enable or false;
-    upsdListen = shushou.power.ups.upsd.listen;
+    enable = youko.power.ups.enable;
+    mode = youko.power.ups.mode;
+    upsmonEnable = youko.power.ups.upsmon.enable;
+    killPowerEnable = youko.systemd.services.ups-killpower.enable or false;
+    upsdListen = youko.power.ups.upsd.listen;
     driver = ups.driver or null;
     port = ups.port or null;
     vendorId = builtins.elem "vendorid = 0665" (ups.directives or [ ]);