in protobuf/benches/proto.rs [74:82]
fn get_log_group_list_bytes(encoded_log_group: &[u8]) -> Vec<u8> {
let mut buffer = Vec::new();
prost::encoding::encode_key(1, prost::encoding::WireType::LengthDelimited, &mut buffer);
prost::encoding::encode_length_delimiter(encoded_log_group.len(), &mut buffer)
.expect("Cannot encode!");
buffer.extend_from_slice(encoded_log_group);
buffer
}