OJS 3.1.1.4 Usage Statistic Plugin Not Working (db metric empty)

Hi all,

I’m sorry for this question, I have read much thread here but I can’t found the same problems.
I use OJS 3.1.1.4
dbmetric is empty
Acron Plugin Enabled
Usage Event Enabled
Usage Statistic Enabled
Usage Statistic Setting
image

Folder files/usageStats/usageStatEvents working

Why db metrics empty?
how make OJS fill this table?

Thank you

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