The new 0.4.0 release of sphinxcontrib-datatemplates will emit a deprecation warning message when the "datatemplate" directive is used. This may break jobs that run sphinx-build with the -W option enabled.

That package includes support for the new form of the directive, which includes a different variation depending on the type of the data source, allowing different options to be used for each directive.

See https://doughellmann.com/blog/2019/06/12/sphinxcontrib-datatemplates-0-4-0/ for details about the release and https://sphinxcontribdatatemplates.readthedocs.io/en/latest/index.html for details about the new syntax.

The 1.0.0 release (not yet scheduled) will drop the legacy form of the directive entirely.