https://packages.debian.org/buster/linux-perf
https://packages.debian.org/buster/stress

Contains command line tool perf.

Doesn't need to check actual performance but running these tests might trigger any potential future regression in the kernel, virtualizer, etc.

Could use:

perf test
perf bench all

If exit code is non-zero and system didn't crash that would be considered a good sign. Actual output would not be parsed.

Also - in graphical mode only:

glxinfo

Same. Only exit code testing. No parsing of results.

netstat -tulpen

stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s