Multiple footer lines in metropolis beamer

Question

How could we add an extra much wider line, with the same colour background of the header, so as to include the institution's logo at the bottom right-hand side of the slide?

The adjusted footer so far is:

\documentclass{beamer}

\usetheme{metropolis}
\setbeamertemplate{frame footer}{\insertshortauthor~(\insertshortinstitute)\hfill\insertshorttitle}

\setbeamerfont{page number in head/foot}{size=\tiny}
\setbeamercolor{footline}{fg=gray}

\author{names}
\institute{institute}
\title{Quack}

\begin{document}
\begin{frame}
content...
\end{frame}
\end{document}

Answer 1

You could redefine the fooline like the following:

\documentclass{beamer}

\usetheme{moloch}% modern fork of the metropolis theme
\setbeamertemplate{frame footer}{\insertshortauthor~(\insertshortinstitute)\hfill\insertshorttitle}

\setbeamerfont{page number in head/foot}{size=\tiny}
%\setbeamercolor{footline}{fg=gray}

\author{names}
\institute{institute}
\title{Quack}

\setbeamercolor{footline}{fg=black!2, bg=mDarkTeal}

\makeatletter
\setbeamertemplate{footline}{%
    \begin{beamercolorbox}[wd=\textwidth, sep=1ex]{footline}
        \usebeamerfont{page number in head/foot}%
        \usebeamertemplate*{frame footer}
        \hfill%
        \raisebox{-2ex}{\includegraphics[height=6ex]{example-image-duck}}
    \end{beamercolorbox}%
}
\makeatother

\begin{document}
\begin{frame}
content...
\end{frame}
\end{document}