By default, Xymon’s trends show metrics for the last 48 hours. Should you want to “only” get the last 24 hours on the main “trends” page, you have to edit the
xymon/server/etc/xymonserver.cfg and edit or add the
TRENDSECONDS variable. 86400 will render only the last 24 hours.
TRENDSECONDS is optimized for the default
INTERVAL values. Setting random or too small
TRENDSECONDS may lead to ugly graphics rendering.