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{    
      "service_key": "e93facc04764012d7bfb002500d5d1a6",
      "incident_key": "disk/local",
      "event_type": "trigger",
      "description": "Disk > 80% for 15 minutes",
      "client": "local",
      "details": {
        "average_value": 63
      }
}

{
	"trigger": {"to": 1428223320, "from": 1428223286, "average_value": 63.0}, 
	"alert": {"rule_type": "global", 
		"metric_value": 80, 
		"metric": "Disk", 
		"period": 900, 
		"metric_type": "%", 
		"above_below": "above"
	}, 
	"server" : {"name": "local"}
}

https://events.pagerduty.com/generic/2010-04-15/create_event.json