The warnf function evaluates the format string, then prints the result to the WARNING log. Hugo prints each unique message once to avoid flooding the log with duplicate warnings.
{{ warnf "The %q shortcode was unable to find %s. See %s" .Name $file .Position }}
Use the [warnidf] function to allow optional suppression of specific warnings.
To prevent suppression of duplicate messages when using warnf for debugging, make each message unique with the [math.Counter] function. For example:
{{ range site.RegularPages }}
{{ .Section | warnf "%#[2]v [%[1]d]" math.Counter }}
{{ end }}