[PATCH manager] report: list recent reboot events and their kernel version

[Alexander Zeidler <a.zeidler@proxmox.com>]

Based on the most recent reboot events, it is possible to determine
whether and when a crash, fencing, or reboot occurred and with which
kernel version the node booted.

Use `wtmpdb last` as a replacement for the well-known `last`, since
the latter became obsolete [0] with Debian Trixie / PVE 9.

 # wtmpdb last reboot --fulltimes --limit 5
 reboot   system boot  7.0.14-5-pve     Mon Jul 20 14:22:34 2026 - still running
 reboot   system boot  7.0.14-5-pve     Thu Jul 16 15:12:16 2026 - crash
 reboot   system boot  7.0.14-5-pve     Thu Jul 16 11:20:15 2026 - Thu Jul 16 15:10:46 2026  (03:50)
 reboot   system boot  7.0.14-5-pve     Wed Jul 15 13:39:34 2026 - crash
 reboot   system boot  7.0.14-2-pve     Wed Jul 15 07:39:18 2026 - Wed Jul 15 13:38:04 2026  (05:58)

 wtmpdb begins Wed Jul 15 07:39:18 2026

[0] https://www.debian.org/releases/trixie/release-notes/issues.html#the-last-lastb-and-lastlog-commands-have-been-replaced

Signed-off-by: Alexander Zeidler <a.zeidler@proxmox.com>
---
 PVE/Report.pm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/PVE/Report.pm b/PVE/Report.pm
index 29433d4a..6049c0bf 100644
--- a/PVE/Report.pm
+++ b/PVE/Report.pm
@@ -36,6 +36,7 @@ my $init_report_cmds = sub {
                 'hostname',
                 'date -R',
                 'cat /proc/cmdline',
+                'wtmpdb last reboot --fulltimes --limit 5',
                 'pveversion --verbose',
                 'cat /etc/hosts',
                 'pvesubscription get',
-- 
2.47.3