The histogram 'Download.DatabaseMainInsertError' is present in Chromium
source code but does not appear in histograms.xml. This means that data is
collected for the histogram but nothing useful is done with it.

The histogram was defined in
components/history/core/browser/download_database.cc at line 615.

https://cs.chromium.org/chromium/src/components/history/core/browser/download_database.cc?l=615

It may have moved by the time you read this.

Please remove the histogram 'Download.DatabaseMainInsertError' from the
source code. If it was very recently added, it may be worth adding it to
histograms.xml instead, but probably not.

This bug was automatically assigned based on git blame information. If you
are not the correct assignee for this bug, please delete the histogram
anyway.