Connections % of configured limit has gone above 80 from Mongo Atlas

removing all IP address and waiting 5 minutes works also for me . seems like it kills all opened connections. Don't forget to allow your ip after that

see my cluster connections

there is an opened issue with mongoose. it might be the root cause https://github.com/Automattic/mongoose/issues/8059

I resolved it by deleting all IP whitelist and wait for 5 minutes.

We can monitor that, the connections are decreasing in mongo atlas cluster. At last, it became Zero.

Then added IP whitelist from anywhere to access(Not secure. Just to work. Or whitelist current IP and server Ip).

Its work fine.