failFast property
If true, only a single attempt at most will be made to run each execution/shard in the matrix.
Flaky test attempts are not affected. Normally, 2 or more attempts are made if a potential infrastructure issue is detected. This feature is for latency sensitive workloads. The incidence of execution failures may be significantly greater for fail-fast matrices and support is more limited because of that expectation.
Implementation
core.bool? failFast;