Collects and records trace data.
A guard that resets the current default dispatcher to the prior default dispatcher when dropped.
Returned if setting the global dispatcher fails.
Trait representing the functions required to collect trace data.
Sets the collector as the default for the current thread for the duration of
the lifetime of the returned
Sets this collector as the global default for the duration of the entire program.
Will be used as a fallback if no thread-local collector has been set in a thread (using
Sets this collector as the default for the current thread for the duration of a closure.