Firecracker v0.12.0

Added

• The /logger API has a new field called options. This is an array of
  strings that specify additional logging configurations. The only supported
  value is LogDirtyPages.
• When the LogDirtyPages option is configured via PUT /logger, a new metric
  called memory.dirty_pages is computed as the number of pages dirtied by the
  guest since the last time the metric was flushed.
• Log messages on both graceful and forceful termination.
• Availability of the list of dependencies for each commit inside the code base.
• Documentation on vsock experimental feature and host setup recommendations.

Changed

• PUT requests on /mmds always return 204 on success.
• PUT operations on /network-interfaces API resources no longer accept
  the previously required state parameter.
• The jailer starts with --seccomp-level=2 (was previously 0) by default.
• Log messages use anonymous-instance as instance id if none is specified.

Fixed

• Fixed crash upon instance start on hosts without 1GB huge page support.
• Fixed "fault_message" inconsistency between Open API specification and code base.
• Ensure MMDS compatibility with C5's IMDS implementation.
• Corrected the swagger specification to ensure OpenAPI 2.0 compatibility.