https://github.com/open-telemetry/opentelemetry-python/blame/b9f31e91a8263bc8effc9abce889d438927d47ec/exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py#L338-L340

.acquire() returns False on timeout, but that's igonred.