presto-main/src/main/java/io/prestosql/failuredetector/FailureDetectorConfig.java/FailureDetectorConfig/setFailureRatioThreshold
class FailureDetectorConfig:    @Config("failure-detector.threshold")
    public FailureDetectorConfig setFailureRatioThreshold(double threshold)
    {
        this.failureRatioThreshold = threshold;
        return this;
    }