Add a VictoriaLogs cluster and point logs-ingest at it (#488)

The k8s log pipeline stores to ClickHouse via NATS+vector, while the VM estate ships journald to a separate puppet-managed VictoriaLogs cluster. Consolidating on VictoriaLogs in-cluster collapses the two paths, and the logs-ingest gateway has no clients yet so it can be repointed now, ahead of the puppet change.

- add VLCluster `logs` at v1.52.0 (2 vlinsert, 2 vlselect, 3 vlstorage, 180d retention, 250Gi each on cephrbd-fast-delete)
- cap vlstorage disk use at 220GiB per node so 180d stays time-based rather than disk-bound
- repoint the logs-ingest HTTPRoute at `vlinsert-logs:9481`
- add a VictoriaLogs Grafana datasource and install its plugin

Nothing is removed here; NATS, ClickHouse, vector, logarchiver and logviewer keep running until a follow-up drops them.

Reviewed-on: #488
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/base/logging/httproute.yaml

@@ -5,7 +5,7 @@ metadata:
   name: logs-ingest-http-redirect
   namespace: logging
   labels:
-    app.kubernetes.io/name: vector-aggregator
+    app.kubernetes.io/name: victorialogs
     app.kubernetes.io/component: ingest
 spec:
   hostnames:
@@ -32,7 +32,7 @@ metadata:
   name: logs-ingest
   namespace: logging
   labels:
-    app.kubernetes.io/name: vector-aggregator
+    app.kubernetes.io/name: victorialogs
     app.kubernetes.io/component: ingest
 spec:
   hostnames:
@@ -46,8 +46,8 @@ spec:
     - backendRefs:
         - group: ""
           kind: Service
-          name: vector-vm-ingest
-          port: 8080
+          name: vlinsert-logs
+          port: 9481
           weight: 1
       matches:
         - path: