Under Essentials Plan, Alert Actions include Ack, Close, Add Team, Add Recipient, and Delete. No custom actions are available under this plan.
Once an Alert is created it needs to be managed. The Alert Actions provided by OpsGenie and the Custom Actions you can define and build yourself are a huge part of Incident Response Orchestration. Making sure the Alerts are being seen and notifying the correct people, reallocating them when necessary, adding notes and attachments, and directing the Alert to gather more information, are all accomplishable goals with accessible Alert Actions.