Add a note about structured logging

Author: solnic

platform-includes/logs/integrations/ruby.mdx

@@ -1,4 +1,4 @@
-To enable structured logging for all loggers that use Ruby [Logger](https://ruby-doc.org/3.4.1/stdlibs/logger/Logger.html) you can enable `:logger` patch:
+To enable logging for all loggers that use Ruby [Logger](https://ruby-doc.org/3.4.1/stdlibs/logger/Logger.html) you can enable `:logger` patch:
 
 ```ruby
 Sentry.init do |config|
@@ -18,6 +18,10 @@ logger.info("Hello from stdlib logger")
 logger.error("Hello from stdlib logger")
 ```
 
+<Alert level="info" title="Note on structured logging">
+Ruby's stdlib logger does not support structured logging, that's why logs are sent to Sentry as plain messages with default attributes added automatically by the SDK.
+</Alert>
+
 ## Ruby on Rails
 
 If you enable `:logger` patch like explained above, this will affect Rails' built-in logger. This means that anything that Rails logs, and any custom usage of the Rails logger, will result in sending log entries to Sentry. For example: