If the objective in the request is both
Import Feature Analysis and Snapshot Analysis, this objective
could be one of them. Otherwise, this objective should be the
same as the objective in the request.
Values:
OBJECTIVE_UNSPECIFIED (0):
If it's OBJECTIVE_UNSPECIFIED, monitoring_stats will be
empty.
IMPORT_FEATURE_ANALYSIS (1):
Stats are generated by Import Feature
Analysis.
SNAPSHOT_ANALYSIS (2):
Stats are generated by Snapshot Analysis.