[metrics-team] Discontinuity on bridge numbers

[nusenu]

>> the bridge authority got replaced, since this
>> wasn't a smooth transition it resulted in a lot of
>> lost bridges because they did not upgraded their tor version
>> which contains the new bridge authority to pubish to.
> 
> I think the new bridge authority is not the whole story, because the
> bridge authority change happened on 2018-07-14, but the missing data
> begins on 2018-07-07 (and ends on 2018-07-21).

the imports from the old bridge auth stopped working before the new
one was created.


> I didn't hear exactly why the bridge authority had to be changed.

yes, there hasn't been much information, so we can only speculate
and you can certainly ask them

2018-07-05 https://blog.torproject.org/support-torservers
2018-07-06 https://trac.torproject.org/projects/tor/ticket/26657
2018-07-06/07 last bridge descriptors

> https://bugs.torproject.org/26771 says the "old one hasn't been getting
> enough maintenance or attention, and now it's stopped sending bridge
> descriptors to bridgedb entirely." It could be that 2018-07-07 is when
> Bifroest (the old authority) stopped sending descriptors?

correct
https://trac.torproject.org/projects/tor/ticket/26711


> I don't understand why the gap extends all the way to 2018-07-21, when
> the changeover happened on 2018-07-14. I would have expected it to start
> at zero and increase a bridges upgraded. (I looked at the similar
> situation in 2016 when the bridge authority changed from Tonga to
> Bifroest, but that's a bit different because the graphs include
> descriptors from both simultaneously.

yes, that was a more coordinated transition since the old one
continued to run while the new one was already there. 





https://trac.torproject.org/projects/tor/ticket/26786
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