You will notice below error while upgrading the TKGI clusters
Last Action Description: Instance update failed: There was a problem completing your request. Please contact your operations team providing the following information: service: p.pks, service-instance-guid: 3xxxxx-4455-4ttt-836f-54ye4uu6fe67, broker-request-id: c22e222e-4dbf-4665-9c77-17764ef30f3d, task-id: 823333, operation: update, error-message: 0 succeeded, 1 errored, 0 canceled
Debug task shows below error
gatekeeper pod is failing in the cluster
TKGI
This is due to Mutating webhooks configuration in the cluster
kubectl get MutatingAdmissionWebhook -A
Reduce the replica of the webhooks to 0, then retry the upgrade.