A bunch of holographic icons were introduced to Stargates a little while ago. If you haven’t already, you should make yourself aware of what they all mean.
There is a support page with details
..and this great graphic:
The Travel Warning Notice tends to stand out to me – and has accurately alerted me to systems that Suicide Gankers were active in. The only issue is I’m normally jumping on contact with the gate, so I notice the warning as I jump through…