[anti-censorship-team] onbasca and rdsys

[meskio]

Hello,

Onbasca[0], a relay bandwidth, has just added support for testing bridges. I 
have modified rdsys to use it[1]. onbasca produces a bandwidth ratio, on how 
fast is a bridge compared to the rest of bridges (1 is the median), and rdsys 
decides if distribute a bridge if the ratio is higher than a configured 
threshold (right now 0.75) or if is jet untested. rdsys does ignore the onbasca 
results if there is less then 50% of bridges with high enough ratio to be 
distributed.

As this was needed by a sponsor I have already deployed it in production. I 
wrote a survival guide:
https://gitlab.torproject.org/tpo/anti-censorship/team/-/wikis/Onbasca-Survival-Guide

I tested it and I don't expect much problems, but as I will be AFK next week if 
rdsys gives any problem is easy to roll back to the previous version of rdsys 
without onbasca support. I left the previous binary of rdsys backend in 
~/bin/rdsys-backend.old, so rolling back will be running as rdsys user in 
polyanthum:
  systemctl --user stop rdsys-backend
  mv ~/bin/rdsys-backend.old ~/bin/rdsys-backend
  systemdl --user start rdsys-backend


[0] https://gitlab.torproject.org/tpo/network-health/onbasca/
[1] https://gitlab.torproject.org/tpo/anti-censorship/rdsys/-/merge_requests/76

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