[Feature Request] Add `visibleTo` field to OpsGenie integration

[hsolberg]

What did you do? I checked the documentation and code and didn't find any option to map the field visibleTo for the OpsGenie integration. The field visibleTo would be very useful to give a team access to see the alert, but not trigger the normal responder workflow.

What do you want to solve? Usecase: Several teams of developers have ownership of several applications each. All these applications have global alerts that the developers want to receive, so they are the responders. The infrastructure team want insight, but doesn't need to respond to the developers alerts and this is where visibleTo comes in.

Suggestion I suggest a new field called visible_to (following the naming scheme that's already in place) that's mapped to OpsGenie's Alert API with the field name visibleTo. Here's the relevant OpsGenie documentation. I've added the relevant row from the table in the documentation below for convenience.

Field	Mandatory	Description	Limit
visibleTo	false	Teams and users that the alert will become visible to without sending any notification. type field is mandatory for each item, where possible values are team and user. In addition to the type field, either id or name should be given for teams and either id or username should be given for users. Please note: that alert will be visible to the teams that are specified within responders field by default, so there is no need to re-specify them within visibleTo field. You can refer below for example values.	50 teams or users in total