added link

Author: ju-shim

articles/virtual-machines/automatic-extension-upgrade.md

@@ -68,6 +68,7 @@ Automatic Extension Upgrade supports the following extensions (and more are adde
 - [Azure Automation Hybrid Worker extension](../automation/extension-based-hybrid-runbook-worker-install.md) - Linux and Windows
 - Dependency Agent – [Linux](./extensions/agent-dependency-linux.md) and [Windows](./extensions/agent-dependency-windows.md)
 - [Application Health Extension](../virtual-machine-scale-sets/virtual-machine-scale-sets-health-extension.md) – Linux and Windows
+- [Guest Attestation Extension](../virtual-machines/boot-integrity-monitoring-overview.md) - Linux and Windows
 - [Guest Configuration Extension](./extensions/guest-configuration.md) – Linux and Windows
 - Key Vault – [Linux](./extensions/key-vault-linux.md) and [Windows](./extensions/key-vault-windows.md)
 - [Azure Monitor Agent](../azure-monitor/agents/azure-monitor-agent-overview.md)