Additional citations (R1) We thank Reviewer 1 for the highly relevant pointers to the statistics literature--these will

We thank all three reviewers for their very thoughtful and detailed comments, with which we largely agree. We will include a detailed example in any revised version. The critique of untested influences refers to potential "unknown unknowns" in the data-27 This is generally not possible in a synthetic system. This is 2599 for networking, 473 for jdk, and 5000 for postgres. We acknowledge there may be issues with low sample sizes and will discuss this in any revised version.