when extracting the data through the extension I get some negative or empty values in the fields “Time to first response” and “Time to resolution”. I want to know what they mean to work with the data.
I'd think that the empty cell means that there is "no SLA related information" and the negative value means that "this much time left from the limit defined by the SLA" (or "this much time after the limit defined by the SLA").
If you wanted to get more meaningful output, use the Better Excel Exporter app. It outputs a readable format for the SLA values (samples):
(Discl. it is a paid and supported app developed by our team. Free for 10 users!)
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