A couple places to start:
webMethods Logging and Monitoring Guide.
Here’s a quote from that guide:
In a development environment, choose level 4 or higher, depending on the extent of debugging necessary. In a production environment, choose level 3 or lower. Recording more information consumes more system resources, so webMethods recommends using levels 5 to 10 only when circumstances truly demand it.
You might also want to review the GEAR 6 Error Handling White Paper.
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