Every log record has a target. A typical logging record looks as follows:

The log record consists of the logging level, the time (not shown in this output), the target, and the message. You can think about the target as a namespace. If no target is specified, the log crate uses the module_path! macro to set one. We can use the target to detect the module where an error or warning has happened or use it for filtering records by name. We will see how to set filtering by environment variable in the following section.