add agent-observability service account and namespace-scoped RBAC

apps/base/logging/agent-observability-rolebinding.yaml

@@ -0,0 +1,16 @@
+---
+# Confines the agent-observability service account (in vm-system) to the
+# agent-observability ClusterRole within this namespace.
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: agent-observability
+  namespace: logging
+subjects:
+  - kind: ServiceAccount
+    name: agent-observability
+    namespace: vm-system
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: agent-observability

apps/base/logging/kustomization.yaml

@@ -17,6 +17,7 @@ resources:
   - configmap_logarchiver.yaml
   - deployment_logarchiver.yaml
   - logviewer
+  - agent-observability-rolebinding.yaml
 
 # Vector pipelines are the single source of truth (also validated by
 # `vector test` in CI). Mounted into each tier via `existingConfigMaps`.