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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.
Lots of his stuff, perf too actually, is built with ebpf, bcc, kprobes and uprobes.. there's lots of ready to run tools, but perhaps more valuably, code examples on how to build your own.
And of course theres Brendan Greggs .. well, everything...( buy his books if you can, but his website has lots of useful bits ).. his flamegraphs are a great way to visualise how much time the system is spending where ... and what the blockers are, just as an example.. ( he's also the only person I've read who talks specifically about "off cpu profiling" )