Values:
UNKNOWN (0):
UNKNOWN indicates a generic condition.
GCE_STOCKOUT (1):
GCE_STOCKOUT indicates that Google Compute Engine resources
are temporarily unavailable.
GKE_SERVICE_ACCOUNT_DELETED (2):
GKE_SERVICE_ACCOUNT_DELETED indicates that the user deleted
their robot service account.
GCE_QUOTA_EXCEEDED (3):
Google Compute Engine quota was exceeded.
SET_BY_OPERATOR (4):
Cluster state was manually changed by an SRE
due to a system logic error.
CLOUD_KMS_KEY_ERROR (7):
Unable to perform an encrypt operation
against the CloudKMS key used for etcd level
encryption.
CA_EXPIRING (9):
Cluster CA is expiring soon.