how to reduce:
1. Stop clock synchronization
systemctl stop chrony

2. Set the timezone to Dublin
timedatectl set-timezone Europe/Dublin

3. Change the time to waitting for Daylight saving time switch
timedatectl set-time "2024-03-30 23:59:50"


At 0 o'clock, the system is executing atop logrotation.

# cat /etc/cron.d/atop 
PATH=/bin:/usr/bin:/sbin:/usr/sbin

# daily restart of atop at midnight
0 0 * * * root [ -d "/run/systemd/system" ] || /usr/share/atop/atop.daily&
0 0 * * * root [ -d "/run/systemd/system" ] && systemctl restart atop

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https://bugs.launchpad.net/bugs/2060082

Title:
  Dublin timezone cause systemd cpu high

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