"Stress testing" refers to running e2e tests repeatedly to identify any potential flakiness or instability. Flakiness refers to tests that sometimes pass and sometimes fail without any changes to the code or test cases. It is essential to ensure that E2E tests are reliable and provide consistent results.

The process typically involves running the E2E tests multiple times. By counting the failures, you can assess the stability of the tests and identify any patterns of flakiness. This approach helps in understanding whether the failures are due to legitimate issues or if there are any inconsistencies causing failures.