One of the features my team found valuable in Opsgenie is the alert. There's also the option to install an app on your phone, so even if you don't have any mobile reception, but you're still connected to WiFi, you still get the alerts via the app, not just via phone call or SMS. The combination of both options was very useful because sometimes you have data and you don't have coverage by mobile, or vice versa. To have both options in terms of receiving alerts was very useful.
Another valuable feature of Opsgenie is the on-call rotation with alerts. I belonged to a small team of three, then the team expanded into four members where everyone was on a weekly on-call basis, with each team member having a week of being on-call. At first, it was a bi-weekly on-call rotation, then it became once every three weeks, and after that, it was once every four weeks, so the on-call rotation with an alert feature was useful.
My previous company had two separate environments, on the cloud and on-premises. My team was in charge of the on-premise environment, so there was a queue for my team with everything in Opsgenie, then the DevOps team had its queue on a group of infrastructure related to the cloud. Each team had its own devices organized in a group that was only managed per team. The on-call rotation was also separated between groups. Opsgenie is a very convenient solution for both teams in my previous company.
