mention version tested

Author: shalier

articles/aks/istio-scale.md

@@ -8,7 +8,7 @@ ms.author: shalierxia
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 # **Istio service mesh add-on performance**
-The Istio-based service mesh add-on is logically split into a control plane (`istiod`) and a data plane. The data plane is composed of Envoy sidecar proxies inside workload pods. Istiod manages and configures these Envoy proxies.This article presents the performance of both the control and data plane, including resource consumption, sidecar capacity, and latency overhead. Additionally, it provides suggestions for addressing potential strain on resources during periods of heavy load. 
+The Istio-based service mesh add-on is logically split into a control plane (`istiod`) and a data plane. The data plane is composed of Envoy sidecar proxies inside workload pods. Istiod manages and configures these Envoy proxies. This article presents the performance of both the control and data plane for v1.19, including resource consumption, sidecar capacity, and latency overhead. Additionally, it provides suggestions for addressing potential strain on resources during periods of heavy load. 
 
 ## Control Plane Performance
 [Istiod’s CPU and memory requirements][control-plane-performance] correlate with the rate of deployment and configuration changes and the number of proxies connected. The scenarios tested were: