You can choose different threshold levels to trigger Visualping notifications. The different levels of thresholds are:
Any Change (notify when any change occurs)
Tiny (notify when change is over 1% difference)
Medium (notify when change is over 10% difference)
Major (notify when change is over 25% difference)
Gigantic (notify when change is over 50% difference)
You can find the threshold setting in the jobs dashboard and job settings.
Job dashboard
Job settings