Evaluation 338[1] is triggered by commit 1d8d69c[2], which only updates the documentation. This evaluation produces 86 useless tests: test.mcron.i686-linux, test.opensmtpd.i686-linux, etc. I believe those tests are triggered at each evaluation (almost), and it's a considerable waste of resources.
[1]: https://berlin.guixsd.org/eval/338 [2]: https://git.savannah.gnu.org/cgit/guix.git/commit/?id=1d8d69c863ae88d5fc20e52e49a22f68c531c1db