The extent to which a single data point contributes to an
overall determination.
Values:
HEURISTIC_RELEVANCE_UNSPECIFIED (0):
Not specified.
HEURISTIC_RELEVANCE_NORMAL (1):
The data point has a limited effect on the
result. Changing the data point is unlikely to
affect the overall determination.
HEURISTIC_RELEVANCE_HIGH (2):
The data point has a strong effect on the
result. Changing the data point is likely to
affect the overall determination.
