Change default policy to HealthyOrPanic #2171
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The current default policy is HealthyOrUnknown, excluding unhealthy endpoints and returning a 503 when none are available.
Health is only checked periodically so a destination may have recovered before the next check. In the case that we don't know of any healthy destinations it's preferable to at least try proxying to a potentially unhealthy one, the request may fail either way. This will also give passive health checks more ongoing data.