Merge branch '8.2' into bugfix-2279-backport

doc/manual/import.rst

@@ -402,11 +402,11 @@ and click `Import`.
 
 To import the file using the API run the following commands::
 
-    http --check-status -b -f POST "<API_URL>/contests/<CID>/problems" [email protected]
+    http --check-status -b -f POST "<API_URL>/contests/<CID>/problems/add-data" [email protected]
 
 To import the file using the CLI run the following command::
 
-    <WEBAPP_DIR>/bin/console api:call -m POST -f data=problems.yaml contests/<CID>/problems
+    <WEBAPP_DIR>/bin/console api:call -m POST -f data=problems.yaml contests/<CID>/problems/add-data
 
 Replace ``<CID>`` with the contest ID that was returned when importing the
 contest metadata.

doc/manual/install-judgehost.rst

@@ -164,7 +164,8 @@ any other tasks on the same CPU core the judgedaemon is using:
 
 On modern distros (e.g. Debian bullseye and Ubuntu Jammy Jellyfish) which have
 cgroup v2 enabled by default, you need to add ``systemd.unified_cgroup_hierarchy=0``
-as well. Then run ``update-grub`` and reboot.
+as well. If you are running systemd v257, you also need to add `SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1`.
+Then run ``update-grub`` and reboot.
 After rebooting check that ``/proc/cmdline`` actually contains the
 added kernel options. On VM hosting providers such as Google Cloud or
 DigitalOcean, ``GRUB_CMDLINE_LINUX_DEFAULT`` may be overwritten