The default RHCOS printk configuration seems to be

$ cat /sys/kernel/printk
7    4    1    7

This is quite verbose (due to the leading 7)

RHEL 8s printk (default install) is

$ cat /sys/kernel/printk
4    4    1    7

much less verbose.

This can lead to weird issues if a load of kernel console messages are generated i.e. due to https://bugzilla.redhat.com/show_bug.cgi?id=1973317

It was noticed that the lower printk configuration is set if the "quiet" kernel argument is set during booting.