Logs play an important part in diagnostics in Fuchsia as they describe human readable events that have happened on a system.
When working with the IDK, you can publish logs with the syslog API which is
available for C in //pkg/syslog and C++ in //pkg/syslog_cpp.
When you work with the IDK, one of the main tools for working with logs is
ffx log to retrieve logs from a Fuchsia device.
To learn more about logging on Fuchsia, see Logging on Fuchsia.