google.cloud.monitoring_v3.types.TimeInterval
The time interval to which the data point applies. For
``GAUGE`` metrics, the start time is optional, but if it is
supplied, it must equal the end time. For ``DELTA`` metrics,
the start and end time should specify a non-zero interval,
with subsequent points specifying contiguous and
non-overlapping intervals. For ``CUMULATIVE`` metrics, the
start and end time should specify a non-zero interval, with
subsequent points specifying the same start time and
increasing end times, until an event resets the cumulative
value to zero and sets a new start time for the following
points.