In general

• SWAP should be approx the same as RAM
• vm.swappiness could be 10 if you have a lot of RAM, but likely higher if you have less RAM

You need to worry about RAM if you get Out of memory errors:

journalctl -k | grep -i 'Out of memory'

Related links

• https://www.linuxatemyram.com/
• https://www.virtualmin.com/docs/system-optimization/low-memory/#debugging-memory-usage