[tor-bugs] #9658 [Tor]: Add extrainfo lines for how many create cells of each handshake type we received/processed

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#9658: Add extrainfo lines for how many create cells of each handshake type we
received/processed
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 Reporter:  arma       |          Owner:
     Type:  defect     |         Status:  new
 Priority:  normal     |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor        |        Version:
 Keywords:  tor-relay  |  Actual Points:
Parent ID:  #9657      |         Points:
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 As part of #9574 Mike suggested that we make relays report how many
 CREATE_FAST, TAP, and NTor circuit-level handshakes they see.

 This data would be most useful if we report "number received" and "number
 processed" for each one, so we can track both sides of the trends.

 I'm not sure if we'll want this in 0.2.4 or 0.2.5 -- it would sure be
 useful to have it in 0.2.4 along with #9574, but it will depend how klunky
 the patch is.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9658>
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