Proper hostname for NERSC-hosted MongoDB (Atomate2 setup)

When setting up the jobflow.yaml file for Atomate2, I am a bit unclear on what to enter for the <>. My MongoDB is being hosted by NERSC. Would I use , or or. localhost ?

And would what I enter here depend on where I’m setting up Atomate2? I.e. if I set up Atomate2 on Cori/Perlmutter, then perhaps I use, whereas if I set it up on NSF XSEDE/ Savio I would maybe use