Docker Promtail or Alloy?

In that same guide, if you checked the docker page, they used Promtail, not Alloy. Does this mean I have to ignore and edit out the Promtail parts?

Also, in the Alloy Tutorial, it should be a simple follow to do exercise, but the localhost:12345 or its redirect link doesn’t work. Do you happened to know why?

(Links below because new user can only post 2 links)

Docker page:
https://grafana.com/docs/loki/latest/setup/install/docker/

Alloy Tutorial:
https://grafana.com/docs/alloy/latest/tutorials/send-logs-to-loki/

Do I have to install Loki (without Promtail) and Alloy separately? Is there no existing docker-compose.yml with Loki and Alloy?