You're seeing just the function which_children, go back to Horde.DynamicSupervisor module for more information.
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Works like DynamicSupervisor.which_children/1.

This function delegates to all supervisors in the cluster and returns the aggregated output. Where memory warnings apply to DynamicSupervisor.which_children, these count double for Horde.DynamicSupervisor.which_children.