Magento 2 Custom Log (for Development purposes)

M2Log.php

<?php

/**
* This snippet is useful to debug in production environments. 
* DON'T USE THIS CODE TO LOG IN YOUR MODULES.
* To create a custom log check Magento official documentation 
* (https://devdocs.magento.com/guides/v2.4/config-guide/log/custom-logger-handler.html)
*/

// Custom Log for Magento v2.3 or < 
(new \Zend\Log\Logger())->addWriter((new \Zend\Log\Writer\Stream(BP . '/var/log/pruebas.log')))->info('Simple Text Log');

// Custom Log for Magento 2.4 or > 
(new \Zend_Log())->addWriter((new \Zend_Log_Writer_Stream(BP . '/var/log/pruebas.log')))->info('Simple Text Log');