How to upgrade version of RHDS 10.0 to 10.3 in RHDS Multi Master Replication architecture

In our infrastructure, we have a two RHDS servers with a Multi-Master Replication topology, we need to upgrade our Operating system (Rhel 7 to Rhel 7.6) and our RHDS servers (10.0.0 to 10.3.0) without loosing services,
so there are several point that we need to know, like :

• How to upgrade RHDS server from 10.0.0 to 10.3.0 ?

• what are the best practices for upgrading a multi-master RHDS topology ?

• how to upgrade RHDS in a multi-master replication topology without service interuption ?

I’d be very grateful if you could help us in our upgrade.

Kind Regards.