A sparkChart is a small chart suitable for inclusion in a
table-cell or inline in text. This message contains the
configuration for a sparkChart to show up on a Scorecard,
showing recent trends of the scorecard's timeseries.
google.protobuf.duration_pb2.Duration
The lower bound on data point frequency in
the chart implemented by specifying the minimum
alignment period to use in a time series query.
For example, if the data is published once every
10 minutes it would not make sense to fetch and
align data at one minute intervals. This field
is optional and exists only as a hint.