Idle PostgreSQL connections from Grafana if autorefresh ON

Using Grafana Cloud Free. Have set up a dashboard and a data source is PostgreSQl hosted on Service limits a user to have 5 ocnnections at the same time, but grafana keeps creating connections without closing it if autorefresh ON or if I refresh very fast:

And after some time I get next error message:

The number of connections is set to 10 for sql datasources in grafana. But this number is not configurable:

Thank you @svenklemm for the answer! What is the purpose to keep a connection open and at the same time open another one?

To query data for different panels in parallel. Or if a panel has multiple queries do those in parallel aswell.

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v5.2.2 fixes a bug which could cause postgres/mysql/mssql datasources to leak connections, see