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Hi, this was a breaking change introduced in OTEL protocol since 0.15.0. https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v0.15.0. But we are not there yet.

How can I help? I've been trying to find the source code of your collector but to no avail

If we bump the version it's breaking for lot of other people who are already running with older version. Please create an issue. Meanwhile you can downgrade the exporter to

0.28.x

to get it work.