As a general comment for the PR, maybe we could include this (or similar text) in the CHANGE_NEXT_RELEASE file:

```
- Introduced a second level of semaphore, as additional security measure to ensure all MongoDB driver invocations run on thread-safe mode
```

It is an "internal refactoring", but I think it make sense to include in the RPM changelog, as it a change that potentially could have effect in the case of problems.