[dnsdist] Marking downstream Unexplained

[Remi Gacogne]

> I have just realized that in verbose mode all queries are logged (I was not 
> aware of that). I am affraid that running dnsdist in verbose mode is not a 
> good idea in production because of the ammount of logs and... without verbose 
> mode setVerboseHealthChecks(true) does not have the effect... what now?

Right, perhaps we should log health check errors if
setVerboseHealthChecks() is set to true, regardless of whether dnsdist
is in verbose mode. I'll make that change.

Remi

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