The exceptions are loggged into the var/log/exception.log file

[dmitrii_fediuk]

magento/magento2/blob/2.0.0/lib/internal/Magento/Framework/Logger/Handler/Exception.php#L16-L16

How to log an exception?

[dmitrii_fediuk]

See also:

• How to diagnose Magento 2 errors
• How does \Magento\Framework\Logger\Monolog::critical() work?
• The default implementation of the \Psr\Log\LoggerInterface is \Magento\Framework\Logger\Monolog
• How does \Magento\Framework\Logger\Monolog::addRecord() work?
• The non-exceptional messages are loggged into the var/log/system.log file
• The debug messages are logged into the var/log/debug.log file
• How to write a message to a log file?