https://github.com/apache/incubator-apisix/blob/82f85e59465c80e27879d9985461d60fe4f77721/apisix/balancer.lua#L254-L269

Currently we only report the HTTP status in the test next stage. However, only unhealthy upstream will trigger a test next try. Does the passive health check make any report when an unhealthy upstream goes healthy? Does the healthy part of the passive health configuration work as expected?
https://github.com/apache/incubator-apisix/blob/82f85e59465c80e27879d9985461d60fe4f77721/apisix/schema_def.lua#L159