[tor-bugs] #2427 [arm]: "Hide duplicates" should hide similar log entries with different parameters

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#2427: "Hide duplicates" should hide similar log entries with different parameters
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 Reporter:  StrangeCharm  |       Owner:  atagar
     Type:  enhancement   |      Status:  new   
 Priority:  normal        |   Milestone:        
Component:  arm           |     Version:        
 Keywords:                |      Parent:        
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 Arm has the facility to hide duplicate log entries. However, the feature
 currently only removes log entries whose text is exactly identical. Many
 log entries produce slightly different text for the same basic entry. For
 instance:

 Possible replay detected! We received an INTRODUCE2 cell with same first
 part of Diffie-Hellman handshake <t> seconds ago. Dropping cell.

 and,

 Error launching circuit to node <name> for service <address>.

 will produce different text, depending on the specific parameters, but are
 essentially the same. The second example is especially prone to appearing
 many times if the connection is interrupted.

 Arm should groups these types of entries, and hide them, whether or not
 the text is exactly identical.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2427>
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