What does (not provided) mean in the /admin/analytics Search Keywords table?
Where are those keywords coming from?
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This is an effect of Google switching logged-in users to encrypted search. The requests of those users no longer contain the keywords that were used for the search.
StackExchange still could access those via the Google Webmaster Tools, as far as I understand it, but the analytics tabs for mods get the data from Google Analytics referrers which don't provide this information anymore for a portion of Google users.
Presumably, the keywords were what the user entered in a search engine which lead to the particular post.