Add MFolderIDsAPICount metric to count FolderIDs in api package (#80866)

* Add MFolderIDsAPICount metric to cound FolderIDs in api package

* Change counter to counter vector with method names as string values

pkg/infra/metrics/metrics.go

@@ -113,6 +113,9 @@ var (
 
 	// MPublicDashboardDatasourceQuerySuccess is a metric counter for successful queries labelled by datasource
 	MPublicDashboardDatasourceQuerySuccess *prometheus.CounterVec
+
+	// MFolderIDsAPICount is a metric counter for folder ids count in the api package
+	MFolderIDsAPICount *prometheus.CounterVec
 )
 
 // Timers
@@ -216,9 +219,24 @@ var (
 	MStatTotalCorrelations prometheus.Gauge
 )
 
+const (
+	GetAlerts                 string = "GetAlerts"
+	GetDashboard              string = "GetDashboard"
+	RestoreDashboardVersion   string = "RestoreDashboardVersion"
+	GetFolderByID             string = "GetFolderByID"
+	GetFolderDescendantCounts string = "GetFolderDescendantCounts"
+	SearchFolders             string = "searchFolders"
+	GetFolderPermissionList   string = "GetFolderPermissionList"
+	UpdateFolderPermissions   string = "UpdateFolderPermissions"
+	GetFolderACL              string = "getFolderACL"
+	Search                    string = "Search"
+	GetDashboardACL           string = "getDashboardACL"
+)
+
 func init() {
 	httpStatusCodes := []string{"200", "404", "500", "unknown"}
 	objectiveMap := map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001}
+	apiFolderIDMethods := []string{GetAlerts, GetDashboard, RestoreDashboardVersion, GetFolderByID, GetFolderDescendantCounts, SearchFolders, GetFolderPermissionList, UpdateFolderPermissions, GetFolderACL, Search, GetDashboardACL}
 
 	MInstanceStart = prometheus.NewCounter(prometheus.CounterOpts{
 		Name:      "instance_start_total",
@@ -456,6 +474,12 @@ func init() {
 		Namespace: ExporterName,
 	}, []string{"datasource", "status"}, map[string][]string{"status": pubdash.QueryResultStatuses})
 
+	MFolderIDsAPICount = metricutil.NewCounterVecStartingAtZero(prometheus.CounterOpts{
+		Name:      "folder_id_api_count",
+		Help:      "counter for folder id usage in api package",
+		Namespace: ExporterName,
+	}, []string{"method"}, map[string][]string{"method": apiFolderIDMethods})
+
 	MStatTotalDashboards = prometheus.NewGauge(prometheus.GaugeOpts{
 		Name:      "stat_totals_dashboard",
 		Help:      "total amount of dashboards",
@@ -747,5 +771,6 @@ func initMetricVars(reg prometheus.Registerer) {
 		MPublicDashboardRequestCount,
 		MPublicDashboardDatasourceQuerySuccess,
 		MStatTotalCorrelations,
+		MFolderIDsAPICount,
 	)
 }