src/Base/Logger/StdioLogger.php
public function emergency($message, array $context = array(), $traceShift = 0)
    {
        $this->log(LogLevel::EMERGENCY, $message, $context, $traceShift);
    }
public function emergency($message, array $context = array(), $traceShift = 0)
    {
        $this->log(LogLevel::EMERGENCY, $message, $context, $traceShift);
    }
System is unusable.

@param string|mixed $message
@param array        $context
@param int          $traceShift
@return void