At Mozilla we're actually currently working to run some of our tests continuously under RR (http://rr-project.org/ http://rr-project.org/), our record-replay de

At Mozilla we're actually currently working to run some of our tests continuously under RR (http://rr-project.org/ http://rr-project.org/), our record-replay debugger. When a flaky test fails the replay can carefully studied to understand why test only fails say 1 out of 10,000 runs.