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It is possible that large numbers of in-flight DNS requests can cause incoming Flows to be dropped. A spike of latency at the DNS resolver or simply too many requests for it to handle can result in data loss.
Seems like at this point step 1 is to add some tracing to the process of enriching flows with DNS so we can figure out where the bottleneck is. @fooker do you have familiarity with the tracing stuff to be able to do that?
It is possible that large numbers of in-flight DNS requests can cause incoming Flows to be dropped. A spike of latency at the DNS resolver or simply too many requests for it to handle can result in data loss.