Google HTTP/S Load Balancing Health Criteria

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If my health checks always return 200, but my backends return a bunch of 5xx's to GLB for actual load-balanced requests, will my backends be considered unhealthy to GLB? My experience seems to say "yes," but I can't find any documentation on this.

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Went to GCP support. They told me that your backend can return 5xx's all day, and as long as the health check returns 200, the load balancer will consider your backend healthy.