1. A method of estimating an impact of a software update, the method comprising: obtaining usage measures for a first instance of a software application; analyzing the software update of the software application by comparing base code for the software application to updated code for the software application; identifying one or more lines of interest from the base code based on the comparing; and aggregating the usage measures for the first instance associated with the lines of interest to determine an impact factor; wherein: the base code corresponds to source code for the first instance; and the updated code corresponds to source code for the software application after the software update is applied to the base code.