Add detailed scanner metrics (#15161)

cmd/storage-datatypes.go

@@ -47,8 +47,8 @@ type DiskInfo struct {
 // the number of calls of each API and the moving average of
 // the duration of each API.
 type DiskMetrics struct {
-	APILatencies map[string]uint64 `json:"apiLatencies,omitempty"`
-	APICalls     map[string]uint64 `json:"apiCalls,omitempty"`
+	LastMinute map[string]AccElem `json:"apiLatencies,omitempty"`
+	APICalls   map[string]uint64  `json:"apiCalls,omitempty"`
 }
 
 // VolsInfo is a collection of volume(bucket) information