Function try_init_log_from_env

pub fn try_init_log_from_env()

A utility function to enable the tracing formatting subscriber.

The tracing_subscriberis initialized from theRUST_LOGenvironment variable. IfRUST_LOG` is not set, then logging is not enabled.

Safety

Calling this function initializes a lazy_static in the tracing crate. Such static is not deallocated prior to process exiting, thus tools such as valgrind will report a memory leak. Refer to this issue: https://github.com/tokio-rs/tracing/issues/2069