Hi!
We’re currently running OJS version 3.3.0-20 and have encountered an issue with article-level usage statistics for a while. On the same day we upgraded from version 3.3.0-17 to 3.3.0-20, all abstract and file statistics stopped being recorded across all journals on our site. Since then, the statistics have flatlined and are no longer updating in the admin interface:
The Usage Statistics plugin is enabled and the Acron plugin is enabled and running.
I’ve checked the PKP support forum, but the issues I found either relate to other versions or suggest a wide range of potential causes. We’re unsure where to look next to identify the problem or how to fix it.
Any advice or guidance on what could be causing this issue, or what logs or configurations we should check would be greatly appreciated 
Thanks in advance!