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amzn-drivers
Official AWS drivers repository for Elastic Network Adapter (ENA) and Elastic Fabric Adapter (EFA)
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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.
It means, for example, writing a FreeBSD kernel driver for Elastic Network Adapter (ENA). Both Linux kernel driver and FreeBSD kernel driver is available at https://github.com/amzn/amzn-drivers
The flame graphs are probably generated using Brendan Gregg's utility, see https://www.brendangregg.com/flamegraphs.html
There is even a post on his blog on FreeBSD and Flame Graphs combined, but I'll grant you the pleasure of finding it yourself ;)