TYPO3 Core

But not too short. A bot shouldn't have to wait for the sitemap. It makes them angry ;)

Perhaps cache lifetime can be matched with a scheduler cycle to have always an up-to-date sitemap.

Bots doesn't care how long it takes, as long as the request didn't timeout. Because you never know if your sitemap is already cached, I already made sure sitemaps are not to big so they probably won't timeout (I don't know on what hosting platform the website is). You can test it in https://review.typo3.org/#/c/58227/.

You want the most up 2 date information at the moment a bot visits your page, because you don't know when he is coming back. So for now the caching period will be 5 minutes by default, but at least that will be configurable.

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58417

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/58417