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/api/folder.go

@@ -9,6 +9,7 @@ import (
 	"github.com/grafana/grafana/pkg/api/apierrors"
 	"github.com/grafana/grafana/pkg/api/dtos"
 	"github.com/grafana/grafana/pkg/api/response"
+	"github.com/grafana/grafana/pkg/infra/metrics"
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/auth/identity"
 	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
@@ -64,6 +65,7 @@ func (hs *HTTPServer) GetFolders(c *contextmodel.ReqContext) response.Response {
 				Title:     f.Title,
 				ParentUID: f.ParentUID,
 			})
+			metrics.MFolderIDsAPICount.WithLabelValues("GetFolders").Inc()
 		}
 
 		return response.JSON(http.StatusOK, hits)
@@ -122,6 +124,7 @@ func (hs *HTTPServer) GetFolderByID(c *contextmodel.ReqContext) response.Respons
 	if err != nil {
 		return response.Error(http.StatusBadRequest, "id is invalid", err)
 	}
+	metrics.MFolderIDsAPICount.WithLabelValues("GetFolderByID").Inc()
 	// nolint:staticcheck
 	folder, err := hs.folderService.Get(c.Req.Context(), &folder.GetFolderQuery{ID: &id, OrgID: c.SignedInUser.GetOrgID(), SignedInUser: c.SignedInUser})
 	if err != nil {
@@ -369,7 +372,7 @@ func (hs *HTTPServer) newToFolderDto(c *contextmodel.ReqContext, f *folder.Folde
 				}, nil
 			}
 		}
-
+		metrics.MFolderIDsAPICount.WithLabelValues("newToFolderDto").Inc()
 		return dtos.Folder{
 			ID:            f.ID, // nolint:staticcheck
 			UID:           f.UID,
@@ -469,6 +472,7 @@ func (hs *HTTPServer) searchFolders(c *contextmodel.ReqContext) ([]dtos.FolderSe
 			UID:   hit.UID,
 			Title: hit.Title,
 		})
+		metrics.MFolderIDsAPICount.WithLabelValues("searchFolders").Inc()
 	}
 
 	return folderHits, nil