Shared image sites (like Wikimedia Commons) offer globalusage in the api, see for example https://commons.wikimedia.org/w/api.php?action=query&prop=globalusage&titles=File:Example.jpg . Looks like it works on every Wikimedia site (https://nl.wikipedia.org/w/api.php?action=query&prop=globalusage&titles=File:Example.jpg). We should implement this as part of site. Probably easiest to expand "def imageusage(self, image, namespaces=None, filterredir=None, step=None, total=None, content=False):" with an option to get globalusage.

Version: core-(2.0)
Severity: enhancement