## New Features
- Added `default_gateway` resource ([#5979](https://github.com/inspec/inspec/pull/5979)).
- Added `linux_audit_system` resource ([#5988](https://github.com/inspec/inspec/pull/5988)).
## Improvements
- Enhanced `file` resource, adding `be_immutable` matcher, `content_as_yaml` and `content_as_json` properties ([#5986](https://github.com/inspec/inspec/pull/5986)).
- Enhanced `service` resource with `be_monitored_by` and `have_start_mode` matchers ([#5981](https://github.com/inspec/inspec/pull/5981)).
- Enhanced `group` resource with `have_gid` matcher ([#5987](https://github.com/inspec/inspec/pull/5987)).
## Bug Fixes
- By default, make cookstyle checks for `inspec check` optional  ([#5989](https://github.com/inspec/inspec/pull/5989)).