As it says in the description, there are no built-in template changes for "Find today's activity for logged-in user" to support. This option was added because people wanted to show activity today for the logged in user on their portal pages or on the navbar.
The meaning of "WWU002: Today info not in cache; running today activity" is that there is no prior post on this page by the user (as of the time the message is issued), so activity today must be calculated. Activity today is only cached for the duration of the page load, as the user may make another post between the page you are viewing and the next. The cache just makes it so activity today isn't queried over and over for the same user if they have 10 posts on the same page. The main activity level, however, is stored in the user data once calculated and reused till the next "midnight."
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