On-Call Role
Each on-call role includes a user designated as a supervisor, who receives notifications when no one is on duty to receive Meridian notifications.
The supervisor must have admin privileges.
Assigning a Group to an On-Call Role
Before assigning a group to an on-call role, you must create a group.
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Log in as a user with administrative permissions. 
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Click the gear icon in the top right. 
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Choose Configure OpenNMS → Configure Users, Groups and On-Call roles and select Configure On-Call Roles. 
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Click Add New On-Call Role and specify a name, supervisor, group and description. 
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Click Save. 
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In the calendar, click the plus (+) icon on the day for which you want to create a schedule. 
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Specify the user, date, and time the user should be on call and click Save:   
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Repeat for other days and users. 
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Click Done to apply the changes.