Values:
STATE_UNSPECIFIED (0):
Unspecified stream state.
CREATED (1):
The stream has been created.
RUNNING (2):
The stream is running.
PAUSED (3):
The stream is paused.
MAINTENANCE (4):
The stream is in maintenance mode.
Updates are rejected on the resource in this
state.
FAILED (5):
The stream is experiencing an error that is
preventing data from being streamed.
FAILED_PERMANENTLY (6):
The stream has experienced a terminal
failure.
STARTING (7):
The stream is starting, but not yet running.
DRAINING (8):
The Stream is no longer reading new events,
but still writing events in the buffer.