Added

• #4287: Document a caveat to the jailer docs when using the --parent-cgroup option, which results in it being ignored by the jailer. Refer to the jailer documentation for a workaround.

Changed

• #4191: Refactored error propagation to avoid logging and printing an error on exits with a zero exit code. Now, on successful exit "Firecracker exited successfully" is logged.

Fixed

• #4277: Fixed a bug that ignored the --show-log-origin option, preventing it from printing the source code file of the log messages.
• #4179: Fixed a bug reporting a non-zero exit code on successful shutdown when starting Firecracker with --no-api.
• #4271: Fixed a bug where Firecracker would log "RunWithApiError error: MicroVMStopped without an error: GenericError" when exiting after encountering an emulation error. It now correctly prints "RunWithApiError error: MicroVMStopped with an error: GenericError".
• #4270: Fixed a bug introduced in #4047 that limited the --level option of logger to Pascal-cased values (e.g. accepting "Info", but not "info"). It now ignores case again.
• #4295: Fixed a bug in the asynchronous virtio-block engine that rendered the device non-functional after a PATCH request was issued to Firecracker for updating the path to the host-side backing file of the device.