From Francesco Pantano:

Manila: which I based the initial patch content from - here is the manila example:

• PR-132: Add sidecar container to stream ManilaAPI log
• this PR-132: Add sidecar container to stream ManilaAPI log patch introduces a sidecar container to stream logs produced by manila-api.
• the LogFile is defined in 01-config.conf, which is a global conf for all the manila-api deployments and adds the ability to provide overrides on a per-service basis.

Here are the 3 glance patches to reach the current status:
PR-263: Use sidecar container to log

• where the glance-log sidecar container was introduced
  PR-376: Move -log sidecar container to dumb-init
• the entrypoint was changed to dumb-init
  PR-561: Improve api logs
• an improvement to avoid some noise in the logs because of the start order