When you are developing a website, you may find the need to log the variables or the custom messages created for the website. While Magento 2 has a built-in log facility based on Monolog library, there will come a time when you need to create a custom logging.You can find this package in the following location: “MAGENTO2_ROOT/vendor/monolog“.

The main Magento 2 log facility class is “Magento\Framework\Logger\Monolog“, and this is defined in “MAGENTO2_ROOT/app/etc/di.xml” as:
<preference for="Psr\Log\LoggerInterface" type="Magento\Framework\Logger\Monolog" />
Read full article : http://www.magesolution.com/blog/cus...ing-magento-2/

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