src/Runner.php
protected function logTask(TaskInterface $task, $level, $message, array $context = array())
    {
        $class = get_class($task);
        $message = sprintf('Task: %s. ', $class) . $message;

        $this->log($level, $message, $context);
    }
protected function logTask(TaskInterface $task, $level, $message, array $context = array())
    {
        $class = get_class($task);
        $message = sprintf('Task: %s. ', $class) . $message;

        $this->log($level, $message, $context);
    }
Logs with an arbitrary level.
Specialized to pass a task instance.

@param TaskInterface $task
@param mixed         $level
@param string        $message
@param array         $context

@return null