1. At least one non-transitory computer-readable storage medium comprising instructions that, when executed, cause a system to: receive a task hierarchy from a data store, the task hierarchy comprising a plurality of task entries, each task entry comprising a list of task entries or a task command, the list of task entries comprising probabilities associated with each task entry in the list of task entries, wherein task commands are executed in a simulated environment to cause actual performance of events to cause usage of physical computing resources, and wherein each probability provides a weight for selection of an associated task entry when traversing the task hierarchy; and execute one or more of the task commands in the simulated environment, wherein executing each of the one or more task commands comprises traversing through the task hierarchy based on the associated probabilities until a task command is reached and executing the task command to cause actual performance of an event to cause usage of at least one of the physical computing resources in the simulated environment.