Logging is an important part of every development process. Logs provide insight into system processes of Magento 2 and are a great tool for tracking errors, significant events, exceptions and many more.\u00a0In order for the logging library to be properly implemented with Magento 2, it must comply with PSR-3 standard.<\/p>\n
Magento 2 comes with built-in logging solution based on Monolog Library<\/a> which will be analyzed further in this article.<\/span><\/p>\n Main Magento 2 log class is \u201cMagento\\Framework\\Logger\\Monolog\u201d<\/em> and is defined in \u201cMAGENTO2_ROOT\/app\/etc\/di.xml\u201d<\/p>\n As mentioned before Monolog is a powerful logging tool that allows the user to use a wide range of handlers to their benefit, such as logging to files and syslog, sending alerts and e-mails, logging database activity, etc.<\/p>\n Logger class has 8 levels of logs and methods for each of those levels, usage of these methods depends on the type of the message user is logging.<\/p>\n Each of these methods accepts 2 arguments, first one is the message itself ( string) and the second one is an optional array (for example instance of an Exception object)<\/p>\n There is another method that can\u00a0be used to log something with an arbitrary level passed as\u00a0 first parameter<\/span><\/p>\n All exceptions, no matter what log level is used, are saved in var\/log\/exception.log<\/p>\n Magento 2 uses dependency injection<\/a> so in order to use logger in our class we must pass it in our class constructor.<\/p>\n Here is an example of how to use logger in a custom class to log an exception.<\/p>\n <\/p>\n Note that we are passing \\Psr\\Log\\LoggerInterface<\/em> in our constructor, as mentioned at the beginning, preference for LoggerInterface is set to Monolog class in di.xml<\/p>\n In some cases it is not necessary to pass logger in constructor as some classes like\u00a0 \u201cMagento\\Framework\\View\\Element\\Template\u201d<\/em> and \u201cMagento\\Framework\\Model\\AbstractModel\u201d<\/em> already have $_logger<\/em> property so if you extend one of these classes logger is already available.<\/p>\n By default, Magento writes to the debug log only in default and develop mode, but not in production mode.<\/p>\n To change the default value in default and develop mode following command can be used:<\/p>\n 1.\u00a0\u00a0bin\/magento setup:config:set –enable-debug-logging=true|false<\/em><\/p>\n 2.\u00a0bin\/magento cache:flush<\/em><\/p>\n Another great Magento 2 functionality is logging database activity. By default, database log is saved in var\/debug\/db.log. Usage of database logging is highly recommended because it allows us to track all database queries and can help us find performance bottlenecks.<\/p>\n Use the following command to enable\/disable database logging:<\/p>\n 1.\u00a0 bin\/magento dev:query-log:enable|disable<\/em><\/p>\n 2.\u00a0\u00a0bin\/magento cache:flush<\/em><\/p>\n As of Magento 2.3.1 version cron log is more extensive and is now logged in var\/log\/cron.log<\/em> instead of var\/log\/system.log<\/em><\/p>\n These were the basics of Magento 2 logging. Even though Magento 2 uses Monolog logger by default other logging solutions can be used by setting preference for LoggerInterface<\/em> as long as it complies with PSR-3 standard.<\/p>\n There are also many other possibilities when it comes to logging such as creating custom handlers for custom log files, sending emails with log data, sending log records to a Slack account, etc.<\/p>\n In case you feel you need some extra help, we can offer you a detailed custom report based on our technical audit<\/a> \u2013 feel free to get in touch and see what we can do for you!<\/span><\/p>\n Note!<\/strong> This article was revised on Aug 26, 2019. The original article was posted in 2015 by Domagoj Potkoc.<\/p>\n The post Magento 2 logging<\/a> appeared first on Inchoo<\/a>.<\/p>\n Logging is an important part of every development process. Logs provide insight into system processes of Magento 2 and are a great tool for tracking errors, significant events, exceptions and many more.\u00a0In order for the logging library to be properly implemented with Magento 2, it must comply with PSR-3 standard. Magento 2 comes with built-in …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[14109,1121,14110,14111,20,14112,257],"tags":[],"class_list":["post-135684","post","type-post","status-publish","format-standard","","category-cron","category-database","category-db-logging","category-logging","category-magento-2","category-monolog","category-programming"],"jetpack_publicize_connections":[],"acf":[],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p99pkJ-zis","_links":{"self":[{"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/posts\/135684"}],"collection":[{"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/comments?post=135684"}],"version-history":[{"count":0,"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/posts\/135684\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/media?parent=135684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/categories?post=135684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sushilkumar.ind.in\/blog\/wp-json\/wp\/v2\/tags?post=135684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<preference<\/span> for<\/span>=\u201dPsr\\Log\\LoggerInterface\u201d type<\/span>=\u201dMagento\\Framework\\Logger\\Monolog\u201d><\/span><\/span><\/code><\/pre>\n$this<\/span>-><\/span>_logger-><\/span> emergency<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\u00a0\u00a0\/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> alert<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> critical<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0 \/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> error<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> warning<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in\u00a0 var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> notice<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> info<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in var\/log\/system.log<\/span>\n \n$this<\/span>-><\/span>_logger-><\/span> debug<\/span>(<\/span>$message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span>\u00a0\u00a0\/\/saved in var\/log\/debug.log (does not work in production mode)<\/span><\/code><\/pre>\n$this<\/span>-><\/span>_logger-><\/span> log<\/span>(<\/span>$level<\/span>,<\/span> $message<\/span>,<\/span> array<\/span> $context<\/span> =<\/span> array<\/span>(<\/span>)<\/span>)<\/span><\/code><\/pre>\nUsing logger class<\/h2>\n
class<\/span> Example\n{<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0private<\/span> $logger<\/span>;<\/span>\n \n\u00a0\u00a0\u00a0\u00a0\u00a0public<\/span> function<\/span> __construct(<\/span>\\Psr\\Log<\/span>\\LoggerInterface $logger<\/span>)<\/span> {<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>-><\/span>logger<\/span> =<\/span> $logger<\/span>;<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0}<\/span>\n \n\u00a0\u00a0\u00a0\u00a0\u00a0public<\/span> function<\/span> exampleMethod(<\/span>)<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0{<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0try {<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/do something<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/span> catch (<\/span>\\Exception $e<\/span>)<\/span> {<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$this<\/span>-><\/span>logger<\/span>-><\/span>critical<\/span>(<\/span>'Error message'<\/span>,<\/span> [<\/span>'exception'<\/span> =><\/span> $e<\/span>]<\/span>)<\/span>;<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/span>\n\u00a0\u00a0\u00a0\u00a0\u00a0}<\/span>\n\u00a0}<\/span><\/code><\/pre>\nDebug Logging<\/h2>\n
Database Logging<\/h2>\n
Cron Logging<\/h2>\n
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