Drupal 8 implements the PSR-3 Logger Interface Standard by default.
PSR-3 Watchdog is a wrapper for drupal 7's watchdog logger that implements the PSR-3 Logger Interface.
Using this module you can integrate third party libraries that support PSR-3 logging without the need for a different logger than the already existing watchdog.
Usage for developers
$logger = new Psr3Watchdog();
Usage for site administrators
Adjust the minimal severity level for this logger at
/admin/config/development/psr3_logger to prevent third party libs from filling your watchdog with notices or debug messages.