We upgraded our RDS Postgresql instance from version 9.4 to 10.11 mainly to access the Performance Insights feature and get a little more monitoring information.

And Performance Insights did not work. It just showed 0 active sessions even when we had over 70 current connections.

After 2 days of trying many different things, parameter changes and DB reboots I managed to get it working with a sad idea:

I turned Performance Insights off and on again.

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