PromEx.get_metrics

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

get_metrics(prom_ex_module)

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Specs

get_metrics(prom_ex_module :: module()) :: String.t() | :prom_ex_down

A simple pass-through to fetch all of the currently configured metrics. This is primarily used by the exporter plug to fetch all of the metrics so that they can be scraped.