Original Go ticket report:
GODRIVER-1761 requests that a databaseName property be added to CommandFailedEvent because storing the corresponding CommandStartedEvent and then retrieving it via the requestId field requires keeping a thread-safe map and the user says that this hurts their performance in highly concurrent applications.

Original DRIVERS ticket that was closed (for context): DRIVERS-1409.

It was decided during triage of DRIVERS-1409 that we just want to do this for databaseName only and nothing more, so we are closing that out and creating this ticket just to do databaseName.