You are debugging a Mule 4 API with Batch Job issues, and the Batch Job standard DEBUG mode is not enough.
To read more about the standard DEBUG mode, please check the following article: How to Enable Mule Batch Debug Logging on Mule 3 and 4
Proceed to turn DEBUG log level for the following package "org.mule.runtime.core.internal.util.journal"
You can enable that from Runtime Manager UI or using log4j2.xml file from within your API. More info in this article: Enable verbose (debug) logging for different Modules in Mule 4
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