The custom field is probably used to indicate if the issue shall trigger a notification or not. There is a piece of code somewhere in your instance that looks at this custom field to evaluate whether the notification shall be suppressed or not.
How this customization is implemented is hard to to say without looking at your system.
aha, got it!
You can with this button suppress notifications based on ticket. In that case I guess your customized script is no longer working as intended. Have you recently upgraded JIRA? This could potentially break customizations like this. Has it stopped work recently?
It is hard to say how this has been implemented from where I sit. You should probably contact someone familiar with your system and also how JIRA can be customized. If you don't have such person in house you can always contact an Atlassian Expert in your area. They can definitely help you!
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