devel-docs: document new "Messages" performance-log parameter

(cherry picked from commit d7de0781)
3 jobs for gimp-2-10 in 33 minutes and 29 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Dependencies
passed #837355
deps-debian/testing

00:11:27

 
  Gimp
passed #837356
gimp-debian/testing-autotools

00:22:01

failed #837357
allowed to fail
gimp-debian/testing-autotools-distcheck

00:21:15

 
Name Stage Failure
failed
gimp-debian/testing-autotools-distcheck Gimp
make[1]: Leaving directory '/builds/GNOME/gimp/_build'
make[1]: *** [Makefile:947: distdir] Error 2
make: *** [Makefile:1054: dist] Error 2
Running after_script
Uploading artifacts for failed job
Uploading artifacts...
_build: found 13975 matching files

Uploading artifacts to coordinator... ok
id=837357 responseStatus=201 Created token=euCPW9Zy
ERROR: Job failed: exit code 1