chore(monitoring): remove vmctl backfill job

One-shot Prometheus history backfill is complete; drop the Job and clean up related comments.

prometheus-stack/k8s/grafana-values.yaml

@@ -39,7 +39,6 @@ grafana:
   # One block covers both the dashboards and datasources sidecars (p95 91M / 80M).
   sidecar:
     datasources:
-      # Chart built-in Prometheus DS disabled: VictoriaMetrics (below) is the default.
       defaultDatasourceEnabled: false
     resources:
       requests:

prometheus-stack/k8s/victoria-secrets.yaml.example

@@ -1,5 +1,3 @@
-# Create the victoria-secrets Secret before deploying VictoriaMetrics.
-# Copy the metrics password from uptime-kuma/k8s/secrets.yaml into the value below.
 apiVersion: v1
 kind: Secret
 metadata:

prometheus-stack/k8s/vmctl-backfill.yaml

@@ -1,31 +0,0 @@
-# One-shot history backfill Prometheus -> VictoriaMetrics via vmctl remote-read.
-# Safe to keep applied: a completed Job is a no-op on re-apply.
-apiVersion: batch/v1
-kind: Job
-metadata:
-  name: vmctl-backfill
-  namespace: prometheus
-spec:
-  backoffLimit: 2
-  ttlSecondsAfterFinished: 3600
-  template:
-    spec:
-      restartPolicy: OnFailure
-      containers:
-        - name: vmctl
-          image: victoriametrics/vmctl:v1.153.0
-          args:
-            - remote-read
-            - -s
-            - --disable-progress-bar
-            - --remote-read-src-addr=http://prometheus-stack-kube-prom-prometheus.prometheus.svc.cluster.local:9090
-            - --remote-read-filter-time-start=2026-09-06T10:26:14Z
-            - --remote-read-step-interval=day
-            - --vm-addr=http://victoria-metrics.prometheus.svc.cluster.local:8428
-          resources:
-            requests:
-              cpu: "200m"
-              memory: "512Mi"
-            limits:
-              cpu: "1000m"
-              memory: "1Gi"