[metrics-bugs] #23829 [Metrics/Onionoo]: Add support for search term negation

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#23829: Add support for search term negation
-----------------------------+------------------------------
 Reporter:  cypherpunks      |          Owner:  metrics-team
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by cypherpunks):

 Thank you for working on this so fast!

 The above description does not clarify if I would write the search term
 for all relays NOT having the guard flag AND NOT having the exit flag as
 {{{
 flag:!guard,exit
 }}}
 or
 {{{
 flag:!guard,!exit
 }}}


 Regarding this feature for other parameter: I would find it useful for the
 following parameter:
 - as
 - country
 - contact (least useful because we can not search for contacts with
 whitespace #21366)

 Examples:
 - Show me all exits that are in France but NOT in OVH AS.
 - Show me all relays located in the OVH AS that are NOT in France.
 - Are there any relays in AS number X that do not have contact Y.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23829#comment:2>
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