[ClusterLabs] Coming in Pacemaker 3.0.1: improvements for systemd resources

[Chris Lumens]

Pacemaker 3.0.1, which will be released in the summer of 2025, will
include an improvement for systemd resources.

Previously, pacemaker would poll systemd resources to detect when start
and stop actions were complete.  However, some resources may take a long
time to stop or start, resulting in pacemaker's polling timing out and
assuming the action failed.

Now, pacemaker will talk to systemd via dbus to be signaled when an
action is complete.  This will allow properly supporting those
resources.  It will also allow pacemaker to more quickly react to
changes in state of all systemd resources.

There is nothing you need to do to take advantage of this improvement.

- Chris