Const
The (uncompressed) size of the message payload in bytes. Also use this attribute if it is unknown whether the compressed or uncompressed payload size is reported.
Use ATTR_MESSAGING_MESSAGE_BODY_SIZE in [incubating entry-point](https://github.com/open-telemetry/opentelemetry-js/blob/main/semantic-conventions/README.md#unstable-semconv).
The (uncompressed) size of the message payload in bytes. Also use this attribute if it is unknown whether the compressed or uncompressed payload size is reported.