[tor-bugs] #15799 [Metrics/Onionoo]: Find out why different instances may report different timestamps in last_changed_address_or_port

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#15799: Find out why different instances may report different timestamps in
last_changed_address_or_port
-----------------------------+------------------------------
 Reporter:  cypherpunks      |          Owner:  metrics-team
     Type:  defect           |         Status:  assigned
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
-----------------------------+------------------------------
Changes (by karsten):

 * keywords:  metrics-2017 =>


Comment:

 I just looked into possible differences between omeiense and oo-hetzner-03
 and found a couple entries from 2017-08-08. Here are the first five:

 {{{
 <
 {"fingerprint":"00D86ED7B4F6E5CCEEBDE01A5BE0C757B879000E","last_changed_address_or_port":"2017-08-08
 17:00:00"},
 ---
 >
 {"fingerprint":"00D86ED7B4F6E5CCEEBDE01A5BE0C757B879000E","last_changed_address_or_port":"2017-08-08
 18:00:00"},


 <
 {"fingerprint":"06F02BE6C9A817A1C9A3402DE0009CBE0EE92D61","last_changed_address_or_port":"2017-08-08
 13:00:00"},
 ---
 >
 {"fingerprint":"06F02BE6C9A817A1C9A3402DE0009CBE0EE92D61","last_changed_address_or_port":"2017-08-08
 18:00:00"},


 <
 {"fingerprint":"071AA2B049C14412A839C0366D3FED260A782BA7","last_changed_address_or_port":"2017-08-08
 16:00:00"},
 ---
 >
 {"fingerprint":"071AA2B049C14412A839C0366D3FED260A782BA7","last_changed_address_or_port":"2017-08-08
 18:00:00"},


 <
 {"fingerprint":"0CD5EBCD07CE9422CF6FC59793683D6002A83C61","last_changed_address_or_port":"2017-08-08
 11:00:00"},
 ---
 >
 {"fingerprint":"0CD5EBCD07CE9422CF6FC59793683D6002A83C61","last_changed_address_or_port":"2017-08-08
 18:00:00"},


 <
 {"fingerprint":"0F3AB504907E10FE6CC48A23E8126936EC28A337","last_changed_address_or_port":"2017-08-08
 17:00:00"},
 ---
 >
 {"fingerprint":"0F3AB504907E10FE6CC48A23E8126936EC28A337","last_changed_address_or_port":"2017-08-08
 18:00:00"},
 }}}

 After some digging I found that that was the date when oo-hetzner-03
 switched from using its own short history to using omeiense's year old
 history.

 This is the only case of differences between omeiense and oo-hetzner-03 in
 the last three months. All subsequent entries are exactly the same.

 I'd say let's accept that there can be minor differences in such edge
 cases like setting up a new service instance and move on.

 I'm removing the metrics-2017 keyword and leaving this ticket open, just
 in case somebody else wants to investigate further. But I wouldn't mind us
 closing it, either.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15799#comment:7>
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