If Azure resources are created manually in a Kublr cluster’s resource group, then Kublr may fail to delete such cluster automatically in some situations.
For example if you create a Virtual Machine manually ing the Kublr cluster’s resource group and connect it to the cluster subnet then you can get the following error when removing the cluster:
Subnet KublrCluster-Subnet is in use by /subscriptions/…/resourceGroups/KublrCluster/providers/Microsoft.Network/networkInterfaces/KublrCluster-NIC/ipConfigurations/ipconfig1 and cannot be deleted. In order to delete the subnet, delete all the resources within the subnet. See aka.ms/deletesubnet.
To fix this error, it is necessary to either remove all manually created resources, or make sure that they do not depend on any of the resources created automatically by Kublr.