Scale Postgres VMs
You can scale VM resources for an individual machine with the
flyctl machine update command:
fly machine update e784079b449483 --memory 1024 --app pg-test
If you have more than one instance in the primary region cluster, scale these VMs identically; they are meant to be interchangeable so the cluster can fail over in case of trouble.
When you created your Fly Postgres cluster, certain Postgres configuration parameters were set to sensible values for the resources being provisioned. This means you may want, or need, to change them if you scale your VM resources. Read Configuration Tuning before scaling down!