MacOS Sierra (10.12) introduced a new logging mechanism called Unified Logging. This mechanism is used to piercing 10, tvOS watchOS 3 and 10 as well.
The developers claim that unified logs will take place Apple, system logs, as well as the Syslog, which is the fact that rely on a fairly large extent for the log analysis on 10.11 and older systems. As of 10.12.1, these magazines still exist. You can get acquainted with the changes in the article: «New macOS Sierra (10.12) Forensic Artifacts – Introducing Unified Logging».
