Alerting nested state cache (#33666)

* nest cache by orgID, ruleUID, stateID

* update accessors to use new cache structure

* test and linter fixup

* fix panic

Co-authored-by: Kyle Brandt <kyle@grafana.com>

* add comment to identify what's going on with nested maps in cache

Co-authored-by: Kyle Brandt <kyle@grafana.com>

pkg/services/ngalert/api/api_prometheus.go

@@ -34,7 +34,7 @@ func (srv PrometheusSrv) RouteGetAlertStatuses(c *models.ReqContext) response.Re
 			Alerts: []*apimodels.Alert{},
 		},
 	}
-	for _, alertState := range srv.manager.GetAll() {
+	for _, alertState := range srv.manager.GetAll(c.OrgId) {
 		startsAt := alertState.StartsAt
 		alertResponse.Data.Alerts = append(alertResponse.Data.Alerts, &apimodels.Alert{
 			Labels:      map[string]string(alertState.Labels),
@@ -89,7 +89,6 @@ func (srv PrometheusSrv) RouteGetRuleStatuses(c *models.ReqContext) response.Res
 			EvaluationTime: 0, // TODO: see if we are able to pass this along with evaluation results
 		}
 
-		stateMap := srv.manager.GetStatesByRuleUID()
 		for _, rule := range alertRuleQuery.Result {
 			var queryStr string
 			encodedQuery, err := json.Marshal(rule.Data)
@@ -114,7 +113,7 @@ func (srv PrometheusSrv) RouteGetRuleStatuses(c *models.ReqContext) response.Res
 				LastEvaluation: time.Time{},
 			}
 
-			for _, alertState := range stateMap[rule.UID] {
+			for _, alertState := range srv.manager.GetStatesForRuleUID(c.OrgId, rule.UID) {
 				activeAt := alertState.StartsAt
 				alert := &apimodels.Alert{
 					Labels:      map[string]string(alertState.Labels),