use internal DNS name for VictoriaMetrics endpoint

apps/victoria-metrics/values.yaml

@@ -1,6 +1,6 @@
 # Values for the upstream victoria-metrics-k8s-stack dependency. This cluster
 # collects metrics only; durable storage and visualization run on the NetBird-
-# connected VPS at 100.71.24.9.
+# connected VPS prd-vps-hel-01.ahmza.com (NetBird address 100.71.24.9).
 victoria-metrics-k8s-stack:
   # Identify this source if more clusters write to the same database later.
   vmagent:
@@ -21,10 +21,14 @@ victoria-metrics-k8s-stack:
       # Queries are served from the VictoriaMetrics base URL. Remote write uses
       # its Prometheus-compatible ingestion endpoint. NetBird encrypts the path
       # between the Talos nodes and VPS, so no public endpoint is involved.
+      #
+      # The name resolves only through internal Technitium DNS (10.10.10.10),
+      # where an authoritative zone maps it to the VPS's NetBird address. If
+      # that address changes, update Technitium rather than this file.
       read:
-        url: http://100.71.24.9:8428
+        url: http://prd-vps-hel-01.ahmza.com:8428
       write:
-        url: http://100.71.24.9:8428/api/v1/write
+        url: http://prd-vps-hel-01.ahmza.com:8428/api/v1/write
 
   # Storage and UI already live on prd-vps-hel-01; do not duplicate them here.
   vmsingle: