PromEx.DashboardRenderer.merge_assigns

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

merge_assigns(dashboard_render, additional_assigns)

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Specs

merge_assigns(t(), keyword()) :: t()

This function will merge in the provided assigns to the struct's assigns. These assigns will then be used during the render_dashboard/1 call to render any EEx template statements.