Values:
STATE_UNSPECIFIED (0):
State is not specified.
STARTING (1):
The control logic is starting the instance.
PROVISIONING (2):
The control logic is installing required
frameworks and registering the instance with
notebook proxy
ACTIVE (3):
The instance is running.
STOPPING (4):
The control logic is stopping the instance.
STOPPED (5):
The instance is stopped.
DELETED (6):
The instance is deleted.
UPGRADING (7):
The instance is upgrading.
INITIALIZING (8):
The instance is being created.
REGISTERING (9):
The instance is getting registered.
SUSPENDING (10):
The instance is suspending.
SUSPENDED (11):
The instance is suspended.
