Document Load Testing

[teg]

This is just to track a discussion we had about documenting the load testing, so we don't forget it.

cc @Gundersanne @lavocatt

Current state

Image Builder is currently being load tested on a weekly basis with failure thresholds reflecting the SLIs. The load tests happen against stage CRC. An example can be found here: https://gitlab.com/osbuild/ci/image-builder/-/jobs/1541382293.

Question

This is cool! Do you have any documentation describing the process? Why gitlab?

Answer

A lot of osbuild's CI runs on gitlab pipelines + aws&openstack runners: https://gitlab.com/osbuild/ci. To access stage we need internal network, and we have that in our CI (since it's IT managed aws), it made sense to run them there as a scheduled pipeline.
We should/could add a bit more to the testing readme actually https://github.com/osbuild/image-builder/blob/main/test/README.md.