[metrics-bugs] #22369 [Metrics/Censorship analysis]: Increase of users in Ukraine due to block of Russia-based services

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#22369: Increase of users in Ukraine due to block of Russia-based services
-----------------------------------------+------------------------------
 Reporter:  dcf                          |          Owner:  metrics-team
     Type:  project                      |         Status:  new
 Priority:  Medium                       |      Milestone:
Component:  Metrics/Censorship analysis  |        Version:
 Severity:  Normal                       |     Resolution:
 Keywords:  censorship block ua          |  Actual Points:
Parent ID:                               |         Points:
 Reviewer:                               |        Sponsor:
-----------------------------------------+------------------------------

Comment (by dcf):

 Replying to [comment:9 dcf]:
 > The blckd.json file changed on 25 May, changing http URLs to https ones.

 Just a small update on this. Previously I claimed that blckd.json files
 were identifiable by their `Last-Modified` and `ETag` headers. That's not
 quite true. 5 of the 6 servers (all but update.svbrwsr.com) share four
 similar `Last-Modified`/`ETag` combinations, as if they are being load
 balanced:
 ||`Last-Modified` ||`ETag` ||
 ||`Thu, 25 May 2017 16:58:03 GMT` ||`"59270d1b-9f8"` ||
 ||`Thu, 25 May 2017 16:58:04 GMT` ||`"59270d1c-9f8"` ||
 ||`Thu, 25 May 2017 16:58:18 GMT` ||`"59270d2a-9f8"` ||
 ||`Thu, 25 May 2017 16:58:21 GMT` ||`"59270d2d-9f8"` ||
 The sixth server, update.svbrwsr.com, is different than the others. Its
 `Last-Modified` and `ETag` have been increasing over irregular intervals:
 ||`Last-Modified` ||`ETag` ||
 ||`Tue, 30 May 2017 13:13:19 GMT` ||`"592d6fef-9f8"` ||
 ||`Wed, 31 May 2017 10:59:25 GMT` ||`"592ea20d-9f8"` ||
 ||`Wed, 31 May 2017 17:46:42 GMT` ||`"592f0182-9f8"` ||
 ||`Thu, 01 Jun 2017 16:19:36 GMT` ||`"59303e98-9f8"` ||
 ||`Fri, 02 Jun 2017 16:33:23 GMT` ||`"59319353-9f8"` ||
 ||`Mon, 05 Jun 2017 10:01:01 GMT` ||`"59352bdd-9f8"` ||

 I know these values from a four-times-daily fetch against each server
 since May 30, 2017.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22369#comment:11>
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