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A payment service subscribes to payment requests through NATS. Run the checkout team's test script as a Job in the checkout namespace, with the required settings, and make sure the payment request arrives.
A freshly rolled out Deployment has its Pods stuck in ImagePullBackOff, and the catalog page it serves returns 503. Read what the cluster reports about the failed pulls, find out why the image does not pull, and get the Pods running.
A railway app publishes two endpoints through an Ingress, and both return 503. Find out why and make both endpoints answer again.
An nginx Deployment runs fine, but its address returns an error. Trace the path from the Ingress to the Pod and fix the manifests.