systemd 243 version brings some major updates:
* Allows ordinary process to send ping requests. Implementation is turned on by default 'net.ipv4.ping_group_range' of sysctl.
sysctl.d/50-default.conf:-net.ipv4.ping_group_range = 0 2147483647
* "Kernel.pid_max" sysctl default Chi is (2 to the power 22) 4194304.
sysctl.d/50-pid-max.conf:kernel.pid_max = 4194304
* Use unified hierarchy (cgroupv2) by default. Use "-Ddefault-hierarchy = hybrid" compile-time to continue to use the previous hybrid.
* Use libidn2 default, a former libidn.
* /Usr/sbin/halt.local no longer supported.
* The management of the unit, monitor kernel's OOM events. OOMPolicy to configure the subsequent behavior.
* Warning message is displayed in yellow. NOTICE before and the same, but highlighted in bold.
* Netword resolved and there are many new features.
Details: https: //lists.freedesktop.org/archives/systemd-devel/2019-September/043401.html
Press: New feature systemd kernel of this project has been followed, for compatibility with old applications are not very concerned about. It has become the de facto standard linux distributions.