Types of ratio-based metric for Dialogflow experiment.
Values:
METRIC_UNSPECIFIED (0):
Metric unspecified.
CONTAINED_SESSION_NO_CALLBACK_RATE (1):
Percentage of contained sessions without user
calling back in 24 hours.
LIVE_AGENT_HANDOFF_RATE (2):
Percentage of sessions that were handed to a
human agent.
CALLBACK_SESSION_RATE (3):
Percentage of sessions with the same user
calling back.
ABANDONED_SESSION_RATE (4):
Percentage of sessions where user hung up.
SESSION_END_RATE (5):
Percentage of sessions reached Dialogflow 'END_PAGE' or
'END_SESSION'.