1. A method comprising: using a computing device, storing a set of one or more sequences of values that describe operating behavior of one or more machines that were observed over one or more windows of time, wherein the set is classified in one or more clusters of operating behavior, wherein at least one sequence of the one or more sequences of values changes over time as the machines operate; using the computing device, causing display, on a display device, of one or more graphical elements that change in appearance over time according to the at least one sequence of values; using the computing device, receiving input comprising a label for the set, and, based at least in part on the input, storing the label in association with the set.