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samplicator
Send copies of (UDP) datagrams to multiple receivers, with optional sampling and spoofing
This tool should help with the UDP duplication beyond the two target challenge with iptables: https://github.com/sleinen/samplicator - still, some additional details on the app/data being transmitted would help; data actually push only? Did you verify that targets other than the original host would correctly interpret the data?
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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It's part of the statsd_exporter.
NOTE:
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Hence, a higher number means a more popular project.