Viewing Configuration Timeline History

For any tracked resource, Config builds a configuration timeline: an ordered history of every configuration item recorded for it. You can scroll back to see exactly how the resource was set up at any past moment, making it a time machine for your infrastructure.

During an incident the timeline answers a critical question: what changed and when. If a security group suddenly allowed traffic from anywhere, the timeline shows when that rule appeared. Pinpointing the moment of change narrows the window you must investigate and helps correlate it with other events.