fix(observability): stabilize stack defaults

oci/charts/observability/templates/vector-agent.yaml

@@ -38,6 +38,10 @@ spec:
           volumeMounts:
             - name: config
               mountPath: /etc/vector
+            {{- if .Values.agent.vector.volume.enabled }}
+            - name: {{ .Values.agent.vector.volume.name }}
+              mountPath: {{ .Values.agent.vector.volume.mountPath }}
+            {{- end }}
             - name: var-log
               mountPath: /var/log
               readOnly: true
@@ -48,6 +52,13 @@ spec:
         - name: config
           configMap:
             name: vector-agent-config
+        {{- if .Values.agent.vector.volume.enabled }}
+        - name: {{ .Values.agent.vector.volume.name }}
+          emptyDir:
+            {{- if .Values.agent.vector.volume.sizeLimit }}
+            sizeLimit: {{ .Values.agent.vector.volume.sizeLimit }}
+            {{- end }}
+        {{- end }}
         - name: var-log
           hostPath:
             path: /var/log

oci/charts/observability/values.yaml

@@ -17,6 +17,8 @@ server:
         persistentVolume:
           enabled: true
           size: 20Gi
+      prometheus-node-exporter:
+        enabled: false
   victoriaMetrics:
     enabled: true
     releaseName: victoria-metrics
@@ -69,6 +71,13 @@ server:
       name: grafana
       version: ">=8.0.0 <9.0.0"
     values:
+      initChownData:
+        enabled: false
+      podSecurityContext:
+        fsGroup: 472
+      securityContext:
+        runAsUser: 472
+        runAsGroup: 472
       persistence:
         enabled: true
         size: 10Gi
@@ -83,6 +92,8 @@ server:
       name: opentelemetry-collector
       version: ">=0.104.0 <1.0.0"
     values:
+      image:
+        repository: otel/opentelemetry-collector-contrib
       mode: deployment
       config:
         receivers:
@@ -159,6 +170,11 @@ agent:
       requests:
         cpu: 100m
         memory: 128Mi
+    volume:
+      enabled: true
+      name: vector-data-dir
+      mountPath: /vector-data-dir
+      sizeLimit: 1Gi
   processExporter:
     enabled: true
     image: