Different "states" of an event

I'm working on a system that has the concept of events. Events can be in three states:

• Active - e.g. a police chase has started, person entered store, car trip started
• Resolved - e.g. a police chase has concluded, person left store, car trip ended
• ??? - e.g. a red light was crossed, item was sold, harsh breaking detected

I'm struggling to come up with suitable terminology for the last type of event. The first two, active and resolved, imply an event that can be ongoing (e.g. has a start and end time), whereas the last type is basically something having to occur at an instant in time.

I've considered potentially using Interdeminate but I feel that won't be very clear for users. I was wondering if there was a more suitable term to use in this instance.

You could try describing the state in time:

• current [is happening]
• ongoing [is happening]
• new [just happened]

The action that needs to be taken in response:

• noResponse [needs a response]
• unassigned [needs an assignment]

Or the stage of processing it's at: - triaged [in the process of getting a response]

A good observation that the system exists in a binary state for a significant period of time and experiences a transitional state between the two binary states has been made in a comment above.

From the question it would seem, the time required to transition between the two states is very little, insignificant even, but still needs to be recognised and recorded by the system.

A number of words exist that may convey this meaning like temporary, transitory and instantaneous amongst others.

As your question is focused on nomenclature, maybe you could consider using:

Active, Pro tem, Resolved

Cambridge dictionary lists the meaning for pro tem as “now and for only a short period”