Avoid duplicate triggers in Zoho Flow / CRM

Avoid duplicate triggers in Zoho Flow / CRM

I have a flow set to post to slack when a field on an opportunity reaches a certain selection from a dropdown.  to do this, the trigger used is Updated module entry / Module = opportunities / field X equals Y.

I want to avoid the flow happening more than one time for a record. As an example, if field X still equals Y, but another field has been updated on the module, how do I tell Zoho Flow to only action this specific record once? I've seen people mention creating a check box on the record that is then checked as a final step in the flow and filtered out at the beginning of the flow, but I'd like to avoid adding a new field just for this purpose if possible.