private double delta(double value) {
        return (1 - this.stepValue) * (1 - 1 / (Math.log(value) / Math.log(step + stepOffset)));
    }
Step normalizer that normalize the value to [0, 1], when value is less than stepVar, it will be normalized with
LinearNormalizer, otherwise it will be normalized with a logarithmic function which approaches 1 while the value
approaches infinity.
core/src/main/java/kafka/autobalancer/common/normalizer/StepNormalizer.java