enable grid on histograms

4 jobs for fixes in 22 minutes and 14 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #141494
docker
build_linux_27

00:22:10

84.0%
passed #141495
docker
build_linux_36

00:22:14

84.0%
passed #141496
macosx
build_macosx_27

00:10:35

84.0%
passed #141497
macosx
build_macosx_36

00:09:58

84.0%