Explicitly specify grpc OTLP protocol with env var #3384
Merged
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Fixes #3166
Most SDK's OTLP exporters default to gRPC but we should be explicit in case there are exporters that prefer another protocol. We want them to use grpc.
I think Python is an example of a protocol that defaults to Protobuf/JSON over HTTP. Customer report of trouble getting Aspire working because they used HTTP.
Microsoft Reviewers: Open in CodeFlow