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samplicator
Send copies of (UDP) datagrams to multiple receivers, with optional sampling and spoofing
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You could also flip this idea on its head and point the feed at something which will replicate the packets to both the endpoints, like samplicator, which you could run on one or the other of the servers if you wanted. I use this sometimes to replicate netflow or syslog data. It does create a bit more dependency chaining, but is simple and basically 'free'.
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