Alerting: Template API to return errutil errors (#91821)

pkg/services/ngalert/provisioning/errors.go

@@ -19,6 +19,7 @@ var (
 	ErrTimeIntervalInUse    = errutil.Conflict("alerting.notifications.time-intervals.used").MustTemplate("Time interval is used")
 
 	ErrTemplateNotFound = errutil.NotFound("alerting.notifications.templates.notFound")
+	ErrTemplateInvalid  = errutil.BadRequest("alerting.notifications.templates.invalidFormat").MustTemplate("Invalid format of the submitted template", errutil.WithPublic("Template is in invalid format. Correct the payload and try again."))
 
 	ErrContactPointReferenced = errutil.Conflict("alerting.notifications.contact-points.referenced", errutil.WithPublicMessage("Contact point is currently referenced by a notification policy."))
 	ErrContactPointUsedInRule = errutil.Conflict("alerting.notifications.contact-points.used-by-rule", errutil.WithPublicMessage("Contact point is currently used in the notification settings of one or many alert rules."))
@@ -54,3 +55,15 @@ func MakeErrTimeIntervalInUse(usedByRoutes bool, rules []models.AlertRuleKey) er
 		Error:  nil,
 	})
 }
+
+// MakeErrTimeIntervalInvalid creates an error with the ErrTimeIntervalInvalid template
+func MakeErrTemplateInvalid(err error) error {
+	data := errutil.TemplateData{
+		Public: map[string]interface{}{
+			"Error": err.Error(),
+		},
+		Error: err,
+	}
+
+	return ErrTemplateInvalid.Build(data)
+}