Represents the different states of a managed domain.
Values:
STATE_UNSPECIFIED (0):
Not set.
CREATING (1):
The domain is being created.
READY (2):
The domain has been created and is fully
usable.
UPDATING (3):
The domain's configuration is being updated.
DELETING (4):
The domain is being deleted.
REPAIRING (5):
The domain is being repaired and may be unusable. Details
can be found in the status_message field.
PERFORMING_MAINTENANCE (6):
The domain is undergoing maintenance.
UNAVAILABLE (7):
The domain is not serving requests.