The current default in OTLP Exporter is grpc : https://github.com/open-telemetry/opentelemetry-rust/blob/main/opentelemetry-otlp/Cargo.toml#L64 This must be changed to use http/protobuf, as perf https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#specify-protocol