Fix acronym caps in GeneratorURL.

Change-Id: Ib18c1f617dcde1039e848059545a6d8831d9bf66

notification/notification.go

@@ -66,7 +66,7 @@ type NotificationReq struct {
 	// A textual representation of the rule that triggered the alert.
 	RuleString string
 	// Prometheus console link to alert expression.
-	GeneratorUrl string
+	GeneratorURL string
 }
 
 type NotificationReqs []*NotificationReq
@@ -135,7 +135,7 @@ func (n *NotificationHandler) sendNotifications(reqs NotificationReqs) error {
 			"Payload": map[string]interface{}{
 				"Value":        req.Value,
 				"ActiveSince":  req.ActiveSince,
-				"GeneratorUrl": req.GeneratorUrl,
+				"GeneratorURL": req.GeneratorURL,
 				"AlertingRule": req.RuleString,
 			},
 		})

rules/manager/manager.go

@@ -187,7 +187,7 @@ func (m *ruleManager) queueAlertNotifications(rule *rules.AlertingRule, timestam
 			Value:        aa.Value,
 			ActiveSince:  aa.ActiveSince.Time(),
 			RuleString:   rule.String(),
-			GeneratorUrl: m.prometheusUrl + rules.GraphLinkForExpression(rule.Vector.String()),
+			GeneratorURL: m.prometheusUrl + rules.GraphLinkForExpression(rule.Vector.String()),
 		})
 	}
 	m.notifications <- notifications