Were you upgraded from Pulse v5.5.1 or previous version?
If you lost the history, it means that the Pulse data migration which happens when upgrading Pulse from Pulse v5.5.1, failed. There could be different reasons why the migration failed.
You can try to redo the migration by following these steps:
- Stop Pulse services
- Delete the new docs.h2.db
- Rename docs.h2.db.bak to docs.h2.db
- Rename Monitor.db.back to Monitor.db
- Start Pulse services (Pulse is going to retry the migration)