Final answer:
Setting the "on.resolved_at" property to No generally indicates that the auto-closure feature will be disabled, as the system relies on resolution timestamps to trigger automatic closures.
Step-by-step explanation:
If the "on.resolved_at" property was set to No, the likely behavior is that the auto-closure feature would be disabled. Without more context, it is difficult to say with certainty, as different systems have different rules.
Typically, such a property would be associated with a ticketing or incident management system. If the property indicating when an incident was resolved is not set (or set to No), the system would not know when to automatically close the incident, leading to the conclusion that the auto-closure feature will be turned off or not trigger without a resolution timestamp.