[tor-bugs] #31790 [Core Tor/Tor]: Add easy-to-parse event and packet tracing logs to circuit padding

[Tor Bug Tracker & Wiki]

#31790: Add easy-to-parse event and packet tracing logs to circuit padding
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     Reporter:  mikeperry  |      Owner:  (none)
         Type:             |     Status:  new
  enhancement              |
     Priority:  Medium     |  Milestone:
    Component:  Core       |    Version:
  Tor/Tor                  |
     Severity:  Normal     |   Keywords:  circpad-researchers-want, wtf-pad
Actual Points:             |  Parent ID:  #31788
       Points:             |   Reviewer:
      Sponsor:             |
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 When we developed the onion service circuit setup obfuscation, it was
 helpful to instrument Tor with log messages that told us when padding and
 non-padding cells were sent.

 This same kind of instrumentation would be useful for a trace simulator,
 but we should do it at the circuit padding cell event callback layer, so
 that it can be used separately from Tor.

 For reference, the analyzer we used is at
 https://github.com/asn-d6/padanalyzer

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31790>
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