man: mention about UINT64_MAX value for OOMKills and ManagedOOMKills DBus properties

Follow-up for 9cf6ad16dd35a95af926f55ccfc9842311d485c3.
Addresses https://github.com/systemd/systemd/pull/38906#discussion_r2363291116.

diff --git a/man/org.freedesktop.systemd1.xml b/man/org.freedesktop.systemd1.xml
index 2b30adab9b4562bfe3ad881760f35105964b9a23..d4dec82c70e92f648abb6fe3a4e538bcc1fd5d40 100644 (file)
--- a/man/org.freedesktop.systemd1.xml
+++ b/man/org.freedesktop.systemd1.xml
@@ -2696,10 +2696,13 @@ node /org/freedesktop/systemd1/unit/avahi_2ddaemon_2eservice {
       <varname>OOMPolicy=kill</varname> is enabled for the unit or not. If enabled, the property contains the
       number of times the kernel OOM killer killed all the processes in the unit's cgroup and its
       descendant cgroups. If disabled, the property contains the number of processes the kernel OOM killer
-      has killed in the unit's cgroup and its descendant cgroups.</para>
+      has killed in the unit's cgroup and its descendant cgroups. When the corresponding cgroups have not
+      been realized, it reports <constant>18446744073709551615</constant> (<constant>2^64 - 1</constant>).</para>
 
       <para><varname>ManagedOOMKills</varname> contains the number of times <command>systemd-oomd</command>
-      killed all the processes in the unit's cgroup and its descendant cgroups.</para>
+      killed all the processes in the unit's cgroup and its descendant cgroups. When the corresponding
+      cgroups have not been realized yet, it reports <constant>18446744073709551615</constant>
+      (<constant>2^64 - 1</constant>).</para>
     </refsect2>
 
     <refsect2>