Add proxy start script (#972)

Signed-off-by: zty98751 <zty98751@alibaba-inc.com>
Co-authored-by: Kent Dong <ch3cho@qq.com>

helm/core/values.yaml

@@ -1,5 +1,6 @@
 revision: ""
 global:
+  liteMetrics: false
   xdsMaxRecvMsgSize: "104857600"
   defaultUpstreamConcurrencyThreshold: 10000
   enableSRDS: true
@@ -337,6 +338,20 @@ global:
   # Use the Mesh Control Protocol (MCP) for configuring Istiod. Requires an MCP source.
   useMCP: false
 
+  # Observability (o11y) configurations
+  o11y:
+    enabled: false
+    promtail:
+      image:
+        repository: grafana/promtail
+        tag: 2.9.4
+      port: 3101
+      resources:
+        limits:
+          cpu: 500m
+          memory: 2Gi
+      securityContext: {}
+
   # The name of the CA for workload certificates.
   # For example, when caName=GkeWorkloadCertificate, GKE workload certificates
   # will be used as the certificates for workloads.