[dnsdist] Dnsdist in front of AD DNS stops several times a day.

[Søren Dam]

Hello, i have set up dnsdist in front of our AD DNS servers to provide
failover and flexibility. They run dnsdist 1.81 on RHEL 8 in front of four
AD servers. and run a modest load of 1500-3000 QPS
But they somehow saturate several times a day, they pattern is this,
suddenly outgoing sessions starts to pile up ( i guess that's what the
"Out" column i the web interface is saying) , and then it soon becomes
unresponsive.
I've run tests with dnsperf and easily run 130K QPS in the very same setup,
but when i put them into production i get this behaviour.
As the only difference between the dnsperf test and production is, as i can
imagine, that the test requests comes from one machine and the test data is
"clean"

Have any of you heard of this before?
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