public void setLookbackPeriodInDays(Double lookbackPeriodInDays) {
        this.lookbackPeriodInDays = lookbackPeriodInDays;
    }
<p>
The number of days for which utilization metrics were analyzed for the function.
</p>

@param lookbackPeriodInDays
       The number of days for which utilization metrics were analyzed for the function.
aws-java-sdk-computeoptimizer/src/main/java/com/amazonaws/services/computeoptimizer/model/LambdaFunctionRecommendation.java