MuleSoft provides a variety of logging and debugging options for Mule apps.
Application logs and a runtime log help you monitor and troubleshoot your apps and the Mule server. For details, see Configuring Logging.
You can enable verbose logging for connectors and modules to record debug level information in the logs.
The Logger component can help you monitor and debug your Mule app by printing important information such as error messages, status notifications, payload data, and so on to a log file and the Anypoint Studio console. You can one or more Logger components to a flow, and you can configure it to print a string that you specify, the output of a DataWeave expression you write, or any combination of strings and expressions. For details, see Logger Component in the Core component documentation.
To control the display of Mule stack traces, you can use command-line arguments or set properties in Anypoint Studio. For details, see Configuring Mule Stack Traces.
To troubleshoot a Mule app in Anypoint Studio, you can use the Studio Visual Debugger, which lets you set breakpoints to stop execution and check events. If you are creating your Mule app outside of Studio, you can either use MUnit to test your app, or you can activate remote debugging. For details, see Debugging Outside Studio.
If you are running your Mule application in CloudHub, see View Log Data for additional information about log data and persistence.