To resolve an incident in the Rootly web UI, click the Mark as Mitigated button on the incident details screen.
You will be presented with a dialog to explain any actions taken to mitigate the incident. Once you've filled it out, click the Mark as Mitigated button once more.
Once all of the followup for the incident has been done, you can resolve it through Rootly by clicking the Mark as Resolved button.
You will be presented with a dialog where you can enter any additional details about the incident resolution. Once completed, click the Mark as Resolved button once more.