Mark Stacey ba6509c7a3 Simplify handling of Segment keys (#9781) ... It was getting rather complicated to keep track of which Segment keys were set where, and under which name. The build script now injects a key even in test environments, but it is unused if `IN_TEST` is truthy. This should be functionally equivalent to the old logic. I find this simpler mainly for two reasons: there is one less intermediate variable to keep track of now, and the `IN_TEST` check is now directly in the module where we're constructing the `segment` instance, rather than being referenced at a distance in a comment. The old setup made it difficult to turn on metrics for specific e2e tests as well, which will be done in a subsequent PR.		2020-11-03 17:11:24 -03:30
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modules	Simplify handling of Segment keys (#9781)	2020-11-03 17:11:24 -03:30