PromEx.ManualMetricsManager.refresh_metrics

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

refresh_metrics(prom_ex_module)

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Specs

refresh_metrics(prom_ex_module :: module()) :: :ok

This function calls into the GenServer and refreshes all of the configured manual metrics data points.