At the moment, many pages are exceeding the proposed #ifexist per-page limit of 100. (Currently this limit is set to 2000, which is already exceeded by some pages). I predict that on the day the new proposed limit is put into operation, some pages will silently break, and there will be tons of "omg!!!111oneone Y my [[page]] doesn't work???77"-like flood in MediaWiki-General or #wikimedia-tech, and many more editors will be at least confused.

So, after the short discussion with Tim Starling, I propose the following:

• If the amount of #ifexist usage on the page is less or equal to 100, it should be indicated only by a comment at the bottom of the rendered HTML (as it is now).
• Otherwise, if it's greater than 100, the warning should be put just before the categories (making it always visible). For &live, the message should go to the very end of output. This warning should be big and red, and a message (I propose to name it [[MediaWiki:ifexist-limit-exceeded]]) with $1 and $2 for usage amount and limit would be nice.

I've set the bug priority to high, because I think that this should be done before the limit is lowered.

Version: unspecified
Severity: enhancement