How to enable debug logging in corosync 2

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Issue

We would like to understand what corosync does in more detail, for example when troubleshooting a communication issue between our cluster nodes.
We were asked to provide corosync debug information from our RHEL 7 cluster by Technical Support. How can we set that?

Environment

Red Hat Enterprise Linux 7 with High Availability Add-On
Red Hat Enterprise Linux 7 with Resilient Storage Add-On

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