1. A method for debugging of a collection of instructions executed, at least in part, by a set of actors, the method comprising: receiving an indication of an error condition associated with the collection of instructions; receiving, from one or more actors in the set of actors, a set of indications comprising indications of messages processed by the one or more actors, indications of associated actor states prior to processing of the messages, and indications of associated actor states subsequent to processing of the messages; determining that a first actor of the set of actors has satisfied the error condition; identifying, based at least in part on the set of indications, one or more messages associated with satisfaction of the error condition; and sending instructions to repeat processing of the one or more messages associated with satisfaction of the error condition, wherein the processing of the one or more messages is repeated by the first actor, and wherein one or more other actors continue to process messages during repetition of the processing of the one or more messages by the first actor.