[metrics-bugs] #22217 [Metrics/metrics-lib]: Parse new padding-counts lines

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#22217: Parse new padding-counts lines
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     Reporter:  karsten              |      Owner:  metrics-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:  metrics-lib 1.7.0
    Component:  Metrics/metrics-lib  |    Version:
     Severity:  Normal               |   Keywords:
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 As found in today's CollecTor logs:

 {{{
 2017-05-10 06:09:07,711 WARN o.t.c.b.SanitizedBridgesWriter:1212
 Unrecognized line 'padding-counts 2017-05-10 01:48:43 (86400 s) bin-
 size=10000 write-drop=10000 write-pad=10000 write-total=10000 read-
 drop=10000 read-pad=10000 read-total=70000 enabled-read-pad=0 enabled-
 read-total=0 enabled-write-pad=0 enabled-write-total=0 max-chanpad-
 timers=0'. Skipping.
 }}}

 We should provide support for parsing these lines in relay descriptors and
 in bridge descriptors if we keep those lines there (#22216).

 Optimistically aiming for 1.7.0.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22217>
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