Istio addon docs

Author: shashankbarsin

articles/aks/istio-about.md

@@ -37,6 +37,7 @@ This service mesh add-on uses and builds on top of open-source Istio. The add-on
 * Istio versions are tested and verified to be compatible with supported versions of Azure Kubernetes Service.
 * Microsoft handles scaling and configuration of Istio control plane
 * Microsoft adjusts scaling of AKS components like `coredns` when Istio is enabled.
+* Microsoft provides managed lifecycle (upgrades) for Istio components when triggered by user.
 * Verified external and internal ingress set-up.
 * Verified to work with [Azure Monitor managed service for Prometheus][managed-prometheus-overview] and [Azure Managed Grafana][managed-grafana-overview].
 * Official Azure support provided for the add-on.