Blurb::
(Experimental) Specify the ``fitness_metric`` used to select the next point
Description::
``adaptive`` sampling is an experimental capability that is not ready
for production use at this time.

The user can specify the ``fitness_metric`` used to select the
next point (or points) to evaluate and add to the set.
The fitness metrics used for scoring candidate points include:

- ``predicted_variance``
- ``distance``
- ``gradient``
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