This is the log of the output you see at the console when you launch the worker.
This is the output of the safety process. This process usually does not experience issues. There typically is not any useful information for debugging.
This is the output of the processes which actually do the generations. They correspond to the main console log output (and therefore bridge.log) as "Process 1" (being bridge_1.log) and so forth.
This has only the errors that appeared in the main console output. You can find these in context by reviewing bridge.log.
These have only the errors that appeared in the working processes. You can find these in context by reviewing the corresponding bridge_n.log.
These are logs of last resort and are typically only populated when something went wrong. There may occasionally be information in these, but they are often empty.