n the legacy installation method, such as Istiod and telemetry v2.</p><p>To safely upgrade from the legacy installation method that uses Helm charts, perform a <a href=/v1.20/blog/2020/multiple-control-planes/>control plane revision</a>. Upgrading in-place is not supported. Upgrading could result in downtime unless you perform a <a href=/v1.20/docs/setup/upgrade/#canary-upgrades>canary upgrade</a>.</p><h2 id=support-ended-for-v1alpha1-security-policy>Support ended for <code>v1alpha1</code> security policy</