1. A computer-implemented method comprising: receiving, by a computing device, one or more execution identifiers, in response to an execution of a first program on one or more client computing devices, wherein each of the one or more execution identifiers corresponds to a function of the first program; identifying, by the computing device, an error-likeliness score for each of the execution identifiers; and determining, by the computing device an error-weight for each of the execution identifiers based on the identified error-likeliness scores for instances of the execution identifiers.