Support Pub/Sub for static master/replica configuration.

[kdebski85]

Add support for Pub/Sub for static master/replica configuration and document that it supports publishing/subscribing only with one node.

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[triumph1]

Hi :) looks like a good idea, any progress?

[mp911de]

This would only work until a failover. I'm not quite sure that is a good idea given that expectations lean towards auto-adoption of infrastructure changes without the need of restarting applications.