Summary
We want to ensure the records are no longer present after truncated has been executed. This could be done in debug mode only through WT_ASSERT.

It would also be great to add statistics to know how many records are truncated.

This will help better diagnose issues related to the truncate API.

Motivation

• Does this affect any team outside of WT?
  No
• How likely is it that this use case or problem will occur?
  Every time truncate is executed
• Is this issue urgent?
  Yes, we have issues that are hard to diagnose that involve the truncate API.

Acceptance Criteria (Definition of Done)

• Testing
  The existing tests might be enough. Just check the stats are generated and the WT_ASSERT is not getting fired.
• Documentation update
  No