Values:
PERIOD_UNSPECIFIED (0):
Do not use.
PERIOD_1_HOUR (1):
Retrieve data for the last hour.
Recommended minimum timed count duration: 1 min.
PERIOD_6_HOURS (2):
Retrieve data for the last 6 hours.
Recommended minimum timed count duration: 10
min.
PERIOD_1_DAY (3):
Retrieve data for the last day.
Recommended minimum timed count duration: 1
hour.
PERIOD_1_WEEK (4):
Retrieve data for the last week.
Recommended minimum timed count duration: 6
hours.
PERIOD_30_DAYS (5):
Retrieve data for the last 30 days.
Recommended minimum timed count duration: 1 day.