Zero-downtime deployments with Docker Swarm: What's the proper way?

Traefik Traefik v2
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I posted this into the "#swarm" Discord channel on "devops.fan" and this is what Martin Braun had to say:

For proper zero downtime you have to tell traefik to use the virtual ip. Look for lbswarm in the settings. Healthchecks are mandatory for this to work properly.

Bret has a good Video on it https://www.youtube.com/live/dLBGoaMz7dQ?feature=share

But with traefik you have to use lbswarm in my experience as that works well with docker healthchecks. Otherwise you have to set up healthchecks somehow in traefik as well.

lbswarm (Traefik configuration)

This was a very helpful direction and I will test this out soon!