If setting ENABLE_WAFFLE_FLAG_METRIC is True, a custom
metric will be added with the values of all WaffleFlag
and CourseWaffleFlags seen during the transaction.
Metric flag values could be False, True, or Both.
The value Both would mean that the flag had both
a True and False value at different times through
the transaction. This is most likely due to having a
check_before_waffle_callback, as is the case with
CourseWaffleFlag.
Example metric value:
"{'another.course.flag': 'False', 'some.flag': 'False', 'some.course.flag': 'Both'}"
Warning: NewRelic does not recommend large custom
metric values due to the potential performance
impact on the agent, so you may just want to
enable when researching usage of a particular flag.
Metric values longer than 255 are truncated.
TODO: A how_to can be added later if we find this
useful, including helpful querying tips.
ARCHBOM-132
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