Postgres could not resize shared memory segment No space left on device

For 15 minutes now my SaaS is unavailable: - my apis are unavailable, their logs tell me they can't connect to PG "Timeout acquiring a connection. The pool is probably full" - PG tells me it can't resize but it uses 6Gb on 50Gb - I increased the volume to 100Gb without any change - Now when I go to the Data tab of the admin it never succeeds - Hosted in Amsterdam also ID: 65aff0db-6586-4be0-8420-b2e67ae4378d