https://learn.microsoft.com/en-us/troubleshoot/azure/azure-kubernetes/create-upgrade-delete/error-code-poddrainfailure
Troubleshoot UpgradeFailed errors due to eviction failures caused by PDBs - Azure | Microsoft Learn
Learn how to troubleshoot UpgradeFailed errors due to eviction failures caused by Pod Disruption Budgets when you try to upgrade an Azure Kubernetes Service...