How long data is kept
On the Free plan:
A case that stays open longer than its evidence is kept (90 days, counted from opening) is closed by everydeck and its evidence removed. If the error comes back, a new case opens.
On Free, a 90-day view can show at most 30 days of raw data.
There is no email when data reaches its retention time. The values are here and under Settings › Workspace › Plan and limits.