1. A method comprising: receiving an exception indicating an occurrence of an error in an application and a path to the exception in an application space; comparing the received exception to a first stored exception in a new version of an exception data structure; comparing the received exception to a second stored exception in a prior version of the exception data structure; based on the comparisons, storing the received exception in the new version of the exception data structure, updating a first count associated with the first stored exception, or updating a second count associated with the second stored exception; and associating a classification with the received exception based on the comparison, the classification indicating the results of the comparison.