Cocktail.Schedule.end_all_recurrence_rules

You're seeing just the function end_all_recurrence_rules, go back to Cocktail.Schedule module for more information.
Link to this function

end_all_recurrence_rules(schedule, end_time)

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Specs

end_all_recurrence_rules(t(), Cocktail.time()) :: t()

Add an end time to all recurrence rules in the schedule.

This has the same effect as if you'd passed the :until option when adding all recurrence rules to the schedule.