Yes in fact, this is not a Splunk problem, but a general one.
But I thought maybe there is some functionality which can help me do that inside of splunk.
I solved that now using iptables with connlimit functionality on the splunk-proxy for the affected ports.
Every further connection attempts will be answered as "connection refused", then our software will cache the logs be it's own until the connection is succeeded.
Well knowing the infrastructure and the behavior of our software i could pick a suitable max number of connections.
Nevertheless thank you for the answer.
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