ULS should have an option to disable it for anonymous users, in a way that

a) applies no language detection and instead uses the content language
b) does not show the ULS widget
c) does not set (and if necessary, deletes) any ULS cookies

This allows ULS to be used an environment such as the Wikimedia cluster, where web caches are used, and these caches can not or do not vary on cookie values (see bug 41451).

This is a rather radical and restrictive solution to 41451, but it should be available, and would allow sites like wikidata.org to function without major changes to the infrastructure.

A more sophisticated solution will be proposed as a separate feature request.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=41451
https://bugzilla.wikimedia.org/show_bug.cgi?id=42159
https://bugzilla.wikimedia.org/show_bug.cgi?id=46306