Disable deprecation log and TypoScript.strictSyntax check
Please disable deprecations at least for the production server, see https://blog.reelworx.at/detail/deprecation-log-handling-in-typo3-9/ and have a look at the errors in typo3_*.log. By scanning the log quickly I assume either setting TypoScript.strictSyntax
to not complain about the old syntax or fixing the syntax to use only the new syntax a lot of lines can be avoided: https://docs.typo3.org/c/typo3/cms-core/master/en-us/Changelog/9.5/Deprecation-86068-OldConditionSyntax.html
var/log:
total 21G
632 Jan 22 15:55 deprecation_806888d44c.log
18K Jan 22 09:40 deprecation_b6651c571c.log
6.8G Jan 22 16:14 typo3_8091321010.log
15G Jan 22 16:14 typo3_deprecations_8091321010.log
Related to t3o/typo3.org#460