There is an opt-in system that submits anonymous plugin usage. More info https://community.nodebb.org/topic/14036/plugin-usage-metrics
nodebb 1.5.1 upgraded on my server i got this problem
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when i got the notifications (follow or chat)
this logic error message
http://127.0.0.1:4567/uid/6/followers
http://127.0.0.1:4567/post/453and broken node.js web server