You can set MettleCI Workbench to log more verbose diagnostic information by adding a line to your MettleCI config.yml file. This file is typically located at /dm/mci/cofig.yml (on Unix) or C:\dm\mci\cofig.yml (on Windows).
To enable verbose logging, add the following lines within the logging: section in your config.yml file:
loggers: com.datamigrators.mettle.process.CommandRunner: DEBUG