We collect user-agent client hint data to support the community in reducing vandalism and abuse on Wikimedia projects. This data is collected and used in accordance with the [https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy privacy policy] and [https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Access_to_nonpublic_personal_data_policy access to nonpublic personal data policy]. See https://www.mediawiki.org/wiki/Extension:CheckUser/Client_Hints for more details.
MediaWiki:Wikimedia-checkuser-api-useragent-clienthints-explanation/en