Digest duplicating emails on scaled nodebb

[exodo]

Having nodebb cluster with 2 servers makes to recieve 2 digest emails

Current example config
1 server with 4 instances and mongo db.
Another server connected through socket.io adress with another 2 instances and using db of main server

[baris]

On one of the servers put this in config.json.

"jobsDisabled": true

It will disable the digests on that server

[exodo]

@baris thank you so much

[julian]

@baris Can you add this to the docs under "Scaling NodeBB" page?