## Why
pdbmux#9 drops primary/prefer and makes configured backend order the only tie-break, so the current `old`-first list would silently reverse which PuppetDB wins.
## How
- Order `PDBMUX_BACKENDS` with `new=http://puppetdb.puppet.svc.cluster.local:8080` first and `old=http://puppetdbapi.service.consul:8080` second, URLs unchanged.
- Drop `PDBMUX_PRIMARY` and `PDBMUX_PREFER`; both already resolve to `new`, on the deployed v0.1.0 image (estate defaults) and on pdbmux main (first-backend fallback), so the rendered behaviour is unchanged today.
- Refresh the configmap and deployment comments to describe order-based precedence.
Merge this before pdbmux#9.
Reviewed-on: #452
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
1172aa3e96