Mixed Target Failover Broken (Local target ignored when Newt target is Unhealthy)

[pinionless]

Describe the Bug

I am running a mixed configuration for a single resource with two targets:

• Newt Target: has health check.
• Local Target, no health check possible (Status: Unknown / -).
  When the Newt target goes down and reports as Unhealthy, Pangolin does not use the Local target.
  Instead, it returns: no available server.
  I have to disable the unhealthy target to switch to local target.

Environment

• OS Type & Version: Ubuntu 22.04
• Pangolin Version: v1.15.2
• Gerbil Version: latest
• Traefik Version: 3.6.7
• Newt Version: 1.9.0

To Reproduce

1. Create a resource with two targets:
   Target A: Site = Newt, (Status: Healthy)
   Target B: Site = Local, (Status: Unknown)
2. Verify traffic flows to Target A (Newt).
3. Simulate Failure for Target A to become Unhealthy

Result: Request returns: no available server.. Traffic is not routed to Target B, even though is reachable from the Pangolin host.

Expected Behavior

Use local site if all other sites report unhealthy

[github-actions]

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