[release-1.28] Fix issue with loadbalancer failover to default server #11327
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Proposed Changes
The loadbalancer should only fail over to the default server if all other server have failed, and it should force fail-back to a preferred server as soon as one passes health checks.
The loadbalancer tests have been improved to ensure that this occurs.
Types of Changes
bugfix
Verification
See linked issue
Testing
yes
Linked Issues
User-Facing Change
Further Comments