Fix 'uninitialized constant GRPC::Interceptor' when with the 'gapic-common' gem #2649
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This PR fixes the error
when gRPC was partially loaded.
This has been reported to us by users of the Google Calendar User Availability API gem. That gem is not publicly available yet, but its dependency on the public
gapic-common
gem is where the issue lies, allowing us to address this issue.gapic-common
only loads a couple file from gPRC, which only contain constants and error classes.There's nothing of value to instrument if only such subset of gPRC is loaded.
This PR ensures we check for the presence of the relevant gPRC client and server files that we actually have an instrumentation point.