Stats: use dashboard stats rather than list (#99130)

pkg/registry/apis/dashboard/legacy/storage.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/grafana/authlib/claims"
@@ -340,5 +341,35 @@ func (a *dashboardSqlAccess) CountRepositoryObjects(context.Context, *resource.C
 
 // GetStats implements ResourceServer.
 func (a *dashboardSqlAccess) GetStats(ctx context.Context, req *resource.ResourceStatsRequest) (*resource.ResourceStatsResponse, error) {
-	return nil, fmt.Errorf("not yet (GetStats)")
+	info, err := claims.ParseNamespace(req.Namespace)
+	if err != nil {
+		return nil, fmt.Errorf("unable to read namespace")
+	}
+	if info.OrgID == 0 {
+		return nil, fmt.Errorf("invalid OrgID found in namespace")
+	}
+
+	if len(req.Kinds) != 1 {
+		return nil, fmt.Errorf("only can query for dashboard kind in legacy fallback")
+	}
+
+	parts := strings.SplitN(req.Kinds[0], "/", 2)
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("invalid kind")
+	}
+
+	count, err := a.dashStore.CountInOrg(ctx, info.OrgID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &resource.ResourceStatsResponse{
+		Stats: []*resource.ResourceStatsResponse_Stats{
+			{
+				Group:    parts[0],
+				Resource: parts[1],
+				Count:    count,
+			},
+		},
+	}, nil
 }