If IBM MQ on z/OS is experiencing a problem, the following links describe how to collect "MustGather" data to find a solution.
Resolving the problem
Collect IBM MQ MustGather data when you first open a problem record so you can provide IBM support the information they need to investigate the problem. Start by selecting the category which best matches the problem on your system:
If your problem type is not listed, follow these instructions:
WebSphere MQ WMQ