Release Notes
If you want to communicate data between Span and Stat over TCP , we highly suggest upgrading your agent to 1.8.4 as it includes a bug fix for it.
Enhancements
[#5522] Allow collector to log received span/stat packet count
[#5651] Avoid storing excessive buffers when using the TcpDataSender
Bugs
[#5523] Fix span serialization when sending over TCP