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Platform · 4 November 2026

Balancer targets receive requests only after their first health check passes

When a balancer has spec.health, each target starts out of rotation: a new target, or every target on a host whose router has just restarted, receives no requests until its first health check passes, which happens within about 100 ms. One passing check is enough, whatever healthyThreshold is. While no target has passed yet, a request waits for the first check result instead of going to every target. If no target passes, requests go to all targets, as before. A target whose first check fails is reported unhealthy immediately.

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