Hello.
I have Signoz self-hosted in AWS EC2, the free version.
It is possible to follow this doc
https://signoz.io/docs/integrations/postgresql/
to get the Postgresql metrics and send them to Signoz or is it necessary to have the paid version?
SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.