include error message in email notification (#8392)

pkg/services/alerting/notifiers/email.go

@@ -69,6 +69,11 @@ func (this *EmailNotifier) Notify(evalContext *alerting.EvalContext) error {
 		return err
 	}
 
+	error := ""
+	if evalContext.Error != nil {
+		error = evalContext.Error.Error()
+	}
+
 	cmd := &m.SendEmailCommandSync{
 		SendEmailCommand: m.SendEmailCommand{
 			Subject: evalContext.GetNotificationTitle(),
@@ -78,6 +83,7 @@ func (this *EmailNotifier) Notify(evalContext *alerting.EvalContext) error {
 				"Name":         evalContext.Rule.Name,
 				"StateModel":   evalContext.GetStateModel(),
 				"Message":      evalContext.Rule.Message,
+				"Error":        error,
 				"RuleUrl":      ruleUrl,
 				"ImageLink":    "",
 				"EmbededImage": "",

pkg/services/alerting/test_notification.go

@@ -2,6 +2,7 @@ package alerting
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/components/null"
@@ -56,7 +57,7 @@ func createTestEvalContext(cmd *NotificationTestCommand) *EvalContext {
 	}
 	ctx.IsTestRun = true
 	ctx.Firing = true
-	ctx.Error = nil
+	ctx.Error = fmt.Errorf("This is only a test")
 	ctx.EvalMatches = evalMatchesBasedOnState()
 
 	return ctx