## The problem
Running the Better Stack collector install command `docker compose -f - up -d --pull always` fails with `validating -: configs.beyla.yaml Additional property content is not allowed`. The error appears on both plain Docker Compose and Docker Swarm deployments, with Docker Compose 2.21.0 installed.
## The fix
Cause: the collector's docker-compose.yml used inlined configs, a feature Docker Compose only supports from 2.23.1 onward, and the reporter was on 2.21.0. Two fixes, confirmed by the maintainers: upgrade Docker Compose to >2.23.1, or (their preferred path) install via `install.sh`, which no longer ships a separate Beyla config at all.