PromEx.Debug.attach_debugger

You're seeing just the function attach_debugger, go back to PromEx.Debug module for more information.
Link to this function

attach_debugger(telemetry_metric_def)

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Specs

attach_debugger(PromEx.telemetry_metrics() | list()) ::
  :ok | PromEx.telemetry_metrics()

Use this function to attach a debugger handler to a certain telemetry event.