[dnsdist] dnsdist[29321]: Marking downstream IP:53 as 'down'

[Rais Ahmed]

Hi,

We have configured dnsdist instance to handle around 500k QPS, but we are seeing downstream down frequently once QPS reached above 25k. below are the logs which we found to relative issue.

dnsdist[29321]: Marking downstream server1 IP:53 as 'down'
dnsdist[29321]: Marking downstream server2 IP:53 as 'down'
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