Old statistics not shown

[marc]

Referring here a post where Clinton explains how metrics were stored in 2.x that could also be useful to recover data from old backups:

OJS usage stats and metrics table

If you have migrated the articles and issues manually, the ids for the galleys, articles, issues, and journal have probably changed, not just the journal id. This will prevent the usage stats tool from rebuilding the metrics table successfully from the logs with the old ids. It will also mean that if you were to migrate the metrics table directly, you would have to translate the assoc_ids for all of these objects. The only current methodology for moving form a multi-journal install to a singl…