Abstract: A system, method, and apparatus are provided for identifying and/or ordering events (or notifications of events) within a computing environment featuring a high rate of events (e.g., hundreds of millions per minute). New events are labeled based on multiple alternating epochs comprising sequences of event identifiers, wherein each epoch's identifiers are mutually exclusive of other epochs. Illustratively, each epoch may commence with a different initial identifier (e.g., 0, 1, 2) and each epoch's sequence of identifiers thereafter increment in the same manner (e.g., by twos, by threes) until a maximum identifier is encountered. All of one epoch's identifiers are applied before the next epoch's are applied. After a last epoch is exhausted, labeling begins again with the first epoch. Verifying or enforcing event ordering may involve determining a given event's identifier, epoch, timestamp, and/or other characteristics, and/or characteristics of a previous event.