Decrease in number of returned documents and wt cache size after upgrade

Hi there,

Hope, someone can help to figure this out. Here is the context:
We’re using telegraf with mogodb plugin. I’m testing behavioral changes between MongoDB 5.0.26 and 6.0.16 and I am seeing, primarily, an increase in wt current cache size and in the document_returned metric: link

I asked gpt to summarize the dif:

I’m trying to get to the RCA of the change and would appreciate any help.

The problem turned out to be this parameter - MongoDB Server Parameters for a Self-Managed Deployment - Database Manual v6.0 - MongoDB Docs - being turned on by default for MongoDB 6 and turned off for MongoDB 5

Can anyone tell what are ‘temporary documents’ in its description? I want to understand what goes to the oplog/image_collection in this case

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