-kernel.sysrq is defined in /etc/sysctl.conf owned by rc-scripts.
-having it here as well, will print notice:
-
-# /lib/systemd/systemd-sysctl
-Overwriting earlier assignment of kernel/sysrq in file '/etc/sysctl.d/99-sysctl.conf'.
-
---- systemd-221/sysctl.d/50-default.conf~ 2015-02-28 18:38:38.000000000 +0200
-+++ systemd-221/sysctl.d/50-default.conf 2015-08-01 22:43:16.307974188 +0300
-@@ -11,12 +11,6 @@
+--- systemd-233/sysctl.d/50-default.conf~ 2017-03-01 22:43:06.000000000 +0100
++++ systemd-233/sysctl.d/50-default.conf 2017-06-28 14:09:04.347320793 +0200
+@@ -11,13 +11,6 @@
# (e.g. /etc/sysctl.d/90-override.conf), and put any assignments
# there.
-# System Request functionality of the kernel (SYNC)
-#
-# Use kernel.sysrq = 1 to allow all keys.
--# See http://fedoraproject.org/wiki/QA/Sysrq for a list of values and keys.
+-# See https://www.kernel.org/doc/html/latest/admin-guide/sysrq.html for a list
+-# of values and keys.
-kernel.sysrq = 16
-
# Append the PID to the core filename