[tor-bugs] #11430 [Onionoo]: Change the meaning of [first|last]_seen from "seen in a network status" to "seen in a network status with the Running flag"

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#11430: Change the meaning of [first|last]_seen from "seen in a network status" to
"seen in a network status with the Running flag"
---------------------+-------------------------
 Reporter:  karsten  |          Owner:  karsten
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:
Component:  Onionoo  |        Version:
 Keywords:           |  Actual Points:
Parent ID:           |         Points:
---------------------+-------------------------
 There are two fields in relay details documents:
 > `last_seen`: UTC timestamp (YYYY-MM-DD hh:mm:ss) when this relay was
 last seen in a network status consensus.
 > `first_seen`: UTC timestamp (YYYY-MM-DD hh:mm:ss) when this relay was
 first seen in a network status consensus.

 And there are similar two fields in bridge details documents:
 > `last_seen`: UTC timestamp (YYYY-MM-DD hh:mm:ss) when this bridge was
 last seen in a bridge network status.
 > `first_seen`: UTC timestamp (YYYY-MM-DD hh:mm:ss) when this bridge was
 first seen in a bridge network status.

 Turns out that these definitions are confusing.  We're not really
 interested in whether a relay or bridge was ''seen'' in a network status,
 but whether the directory authorities or the bridge authority thought it
 was ''running''.  So, whether the relay or bridge had the `Running` flag.

 For relays this doesn't matter, because the consensus only contains
 running relays.  (It ''will'' matter though once we add votes to Onionoo,
 because those include relays that don't have the `Running` flag.)

 But for bridges it matters.  Tonga includes all bridges in its network
 status that send it descriptors, including those without the `Running`
 flag.

 Once we change the meaning of `last_seen`, we'll also stop giving out
 bridges that haven't been running for a week but that kept sending
 descriptors to Tonga.  Should be fine.

 This is going to fix #11410.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11430>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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