In this case, you are taking into account all user actions within a given application. Relative and absolute thresholds refer to thresholds set based on the deviation from the baseline, not the baseline itself.
An example of an absolute value might be 100 ms. An example of a relative value might be 50%. As in your case (in the sum of the default setting in DT). Absolute value means a specific number. A relative value means a percentage increase.