public InstanceRecommendation withRecommendationSources(java.util.Collection<RecommendationSource> recommendationSources) {
        setRecommendationSources(recommendationSources);
        return this;
    }
<p>
The timestamp of when the instance recommendation was last generated.
</p>

@param lastRefreshTimestamp
       The timestamp of when the instance recommendation was last generated.
aws-java-sdk-computeoptimizer/src/main/java/com/amazonaws/services/computeoptimizer/model/InstanceRecommendation.java