A container that logged to stdout and to a file

An application writing to both, which doubles the disk and halves the usefulness of each.

  stdout   collected by the runtime, shipped to the
           log store, structured, queryable
  a file    inside the container, rotated by a
           logrotate rule on the host that cannot see
           it, growing until the container is replaced

and the two are not identical: the file has the
framework's default format and stdout has ours,
because two channels were configured independently in
2021 and 2023.

the file was 4.1 GB.

A container writing to a file is a container whose logs disappear when it is replaced, which is either fine or a serious gap depending on whether anybody knew. The two formats diverging is the more interesting finding — a grep that works against one produces nothing against the other, which had confused an investigation in February.