% arara: pdflatex
% arara: makeglossaries
% arara: pdflatex
% arara: pdflatex
\documentclass{article}

\usepackage[colorlinks]{hyperref}
\usepackage[undefaction=warn]{glossaries-extra}

\makeglossaries

\newglossaryentry{sample}{name=sample,description={an example}}

\begin{document}

Defined entry: \gls{sample}, \glslink{sample}{text}.

This paragraph will trigger a warning.
Undefined entry: \gls{undefined}, \glslink{undefined}{text}.

\printglossaries
\end{document}