market-alb forwards to the shop's web servers in web-tg by default. The API runs on its own server, in api-tg. A colleague added a rule to send the API there, and since then the shop's honey page, /apiary, is broken.

1. Keep the load balancer's ARN in LB, its listener's ARN in LISTENER, the two target groups' ARNs in TG and API_TG, and its DNS name in DNS.
2. Fetch /apiary, /api and /api/items through the load balancer and see where each one goes. List the listener's rules.
3. Fix the API rule so that /api and everything under /api/ reach the API server, and /apiary reaches the shop again.
4. The admin pages are closed for maintenance: /admin should get a 503 with an HTML page saying Back soon, answered by the load balancer itself.
5. Carts live in the web servers' memory. Keep each browser on one web server for an hour, and check it with a cookie jar.