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Some of these charts are made using rrdtool:

https://oss.oetiker.ch/rrdtool/

rrdtool is still used widely today by projects like Munin, LibreNMS and Collectd.

ISP operations/back-end systems perspective, there's indeed tons of RRA files out there still getting charts drawn based off them with rrdtool, but increasingly everyone is trying to store metrics in things like influxdb and draw them using grafana. Or similar. Even Cacti, a truly old and crufty thing that's been around for a long time has migrated to drawing charts as SVGs.

I yearn for the simplicity of rrdtool and Cacti and all that.

I despise trying to setup Grafana with its constant moving goals.

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