Values:
STATE_UNSPECIFIED (0):
Collector state is not recognized.
STATE_INITIALIZING (1):
Collector started to create, but hasn't been
completed MC source creation and db object
creation.
STATE_READY_TO_USE (2):
Collector has been created, MC source
creation and db object creation completed.
STATE_REGISTERED (3):
Collector client has been registered with
client.
STATE_ACTIVE (4):
Collector client is actively scanning.
STATE_PAUSED (5):
Collector is not actively scanning.
STATE_DELETING (6):
Collector is starting background job for
deletion.
STATE_DECOMMISSIONED (7):
Collector completed all tasks for deletion.
STATE_ERROR (8):
Collector is in error state.
