feat(alerting): add alert history api endpoint

ref #5850

pkg/api/alerting.go

@@ -8,6 +8,7 @@ import (
 	"github.com/grafana/grafana/pkg/middleware"
 	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/alerting"
+	"github.com/grafana/grafana/pkg/services/annotations"
 )
 
 func ValidateOrgAlert(c *middleware.Context) {
@@ -212,3 +213,34 @@ func DeleteAlertNotification(c *middleware.Context) Response {
 
 	return ApiSuccess("Notification deleted")
 }
+
+func GetAlertHistory(c *middleware.Context) Response {
+	query := &annotations.ItemQuery{
+		AlertId: c.ParamsInt64("alertId"),
+		Type:    annotations.AlertType,
+		OrgId:   c.OrgId,
+		Limit:   c.QueryInt64("limit"),
+	}
+
+	repo := annotations.GetRepository()
+
+	items, err := repo.Find(query)
+	if err != nil {
+		return ApiError(500, "Failed to get history for alert", err)
+	}
+
+	var result []dtos.AlertHistory
+	for _, item := range items {
+		result = append(result, dtos.AlertHistory{
+			AlertId:   item.AlertId,
+			Timestamp: item.Timestamp,
+			Data:      item.Data,
+			NewState:  item.NewState,
+			Text:      item.Text,
+			Metric:    item.Metric,
+			Title:     item.Title,
+		})
+	}
+
+	return Json(200, result)
+}

pkg/api/api.go

@@ -250,11 +250,12 @@ func Register(r *macaron.Macaron) {
 
 		r.Group("/alerts", func() {
 			r.Post("/test", bind(dtos.AlertTestCommand{}), wrap(AlertTest))
-			//r.Get("/:alertId/states", wrap(GetAlertStates))
 			r.Get("/:alertId", ValidateOrgAlert, wrap(GetAlert))
 			r.Get("/", wrap(GetAlerts))
 		})
 
+		r.Get("/alert-history/:alertId", ValidateOrgAlert, wrap(GetAlertHistory))
+
 		r.Get("/alert-notifications", wrap(GetAlertNotifications))
 
 		r.Group("/alert-notifications", func() {

pkg/api/dtos/alerting.go

@@ -52,3 +52,14 @@ type EvalMatch struct {
 	Metric string            `json:"metric"`
 	Value  float64           `json:"value"`
 }
+
+type AlertHistory struct {
+	AlertId   int64     `json:"alertId"`
+	NewState  string    `json:"netState"`
+	Timestamp time.Time `json:"timestamp"`
+	Title     string    `json:"title"`
+	Text      string    `json:"text"`
+	Metric    string    `json:"metric"`
+
+	Data *simplejson.Json `json:"data"`
+}