Credo.CLI.Output.priority_name

You're seeing just the function priority_name, go back to Credo.CLI.Output module for more information.
Link to this function

priority_name(issue_or_priority)

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Returns a suitable name for a given priority.

iex> Credo.CLI.Output.priority_name(:normal)
"normal"

iex> Credo.CLI.Output.priority_name(1)
"normal"

iex> Credo.CLI.Output.priority_name(%Credo.Issue{priority: 1})
"normal"