Similarly, as it can be done for the events that are based on Jira dates, the concurrence rules can be defined for the events that are based on custom sources, including the sources that are created based on the custom-defined event types.
To create concurrence rules for custom events open the configuration of a custom source. Then, select one of the options:
Allow concurrent events
Don't allow concurrent events
Don't allow concurrent events on assignee level
Note that you can treat issues like resources and forbid the event creation on issue level.
The concurrence rules don’t apply to recurrent events.