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GCP: serving a maintenance page using an HTTPS LB and container native routing

No matter how highly available your services, there may still be significant backend events that require planned maintenance.  During this downtime, you should still reply to end users and service integrations with a proper response. In this article, I will show you how to configure your GCP HTTPS Loadbalancer so that a single maintenance service GCP: serving a maintenance page using an HTTPS LB and container native routing