fix: Apply "version" tag only when the span service name matches the default service name #157
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Description
Apply version tag to a span only if its service name matches the default service name. This may be viewed as a breaking change since now some spans that are started with a new service name will not have the "version" tag set.
Motivation
This behavior conforms to our Config Consistency initiative
Additional Notes
As this may be breaking, we could put this new behavior behind a feature flag, but I'm inclined to say that this is a FIX rather than a FEATURE.
Jira ticket: APMAPI-517