[tor-bugs] #29801 [Core Tor/Tor]: Write a proposal for IPv6 "Happy Eyeballs" on Tor clients

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#29801: Write a proposal for IPv6 "Happy Eyeballs" on Tor clients
-------------------------------------------------+-------------------------
 Reporter:  neel                                 |          Owner:  teor
     Type:  enhancement                          |         Status:  closed
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  ipv6, prop299,                       |  Actual Points:  1.5
  042-deferred-20190918                          |
Parent ID:  #17835                               |         Points:
 Reviewer:  neel                                 |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  merge_ready => closed
 * resolution:   => fixed
 * actualpoints:  1 => 1.5


Comment:

 These statistics were in a previous draft, and they seemed useful, so I
 added them back as optional:
 * client and relay connections
 * statistics in the heartbeat logs

 I also improved the explanation of the "extra prop 306 connections"
 statistic.

 I squashed this PR in:
 * torspec master: https://github.com/torproject/torspec/pull/102
 Then I merged it to master.

 I also emailed to the tor-dev list:
 https://lists.torproject.org/pipermail/tor-dev/2020-January/014125.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29801#comment:36>
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