https://www.tecmint.com/command-line-tools-to-monitor-linux-performance/

https://www.tecmint.com/linux-performance-monitoring-with-vmstat-and-iostat-commands/

https://www.tecmint.com/linux-performance-monitoring-tools/

https://geekflare.com/linux-performance-commands/

https://medium.com/@chrishantha/linux-performance-observability-tools-19ae2328f87f

https://www.thegeekstuff.com/2011/12/linux-performance-monitoring-tools/

http://www.brendangregg.com/linuxperf.html

https://training.linuxfoundation.org/training/linux-performance-tuning/