[tor-bugs] #33421 [Metrics/Onionperf]: Track which Guard is used for experimental measurements

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#33421: Track which Guard is used for experimental measurements
-------------------------------------------------+-------------------------
 Reporter:  acute                                |          Owner:  karsten
     Type:  enhancement                          |         Status:
                                                 |  accepted
 Priority:  Medium                               |      Milestone:
Component:  Metrics/Onionperf                    |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  metrics-team-roadmap-2020, metrics-  |  Actual Points:
  team-roadmap-2020-june                         |
Parent ID:  #33321                               |         Points:  3
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor59-must
-------------------------------------------------+-------------------------
Changes (by karsten):

 * cc: asn (added)


Comment:

 Is it possible that the `GUARD` event is not implemented (anymore) as
 specified in control-spec.txt?

 The only `GUARD` event that I was able to trigger was `GUARD DROPPED` in
 response to calling Stem's `drop_guards()`:

 {{{
 2020-06-08 13:37:15 1591623435.81 650 GUARD ENTRY
 $98350B16551452ABC7F3457D06032CD30F7280CE~carbons DROPPED
 2020-06-08 13:37:15 1591623435.81 650 GUARD ENTRY
 $ADB98B27D7A3FB5732068FD23602A1BCB3BE9F38~Assange008fr DROPPED
 2020-06-08 13:37:15 1591623435.81 650 GUARD ENTRY
 $4E98AA295B7171996D18DD1F6A19F64AB4036B4A~summalummadooma DROPPED
 2020-06-08 13:37:15 1591623435.81 650 GUARD ENTRY
 $0C6D3655763B1A3A60FC42135CD60765AFE953BA~aSmallRelay DROPPED
 ... 16 more...
 }}}

 But I didn't spot any other `GUARD` events. Which matches my understanding
 of the Tor sources where `control_event_guard()` is only called in a
 single place.

 Is it maybe possible that the `GUARD` event has been broken during the One
 Guard Revolution? Calling in comrade asn.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33421#comment:13>
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