| 0 | Master Size | 0 | 0 | VT_COUNTER | keys | This meter reports the total size of the master key cache for this counter group, representing the total number of active keys at the end of the streaming window. |
| 1 | MRU Size | 0 | 0 | VT_COUNTER | keys | This meter reports the size of the most recently used cache for this counter group. |
| 2 | Pending KU Size | 0 | 0 | VT_COUNTER | keys | This meter reports the number of key updates currently pending and not yet flushed for this counter group. |
| 3 | Flush US | 0 | 0 | VT_GAUGE | usec | This meter reports the number of microseconds taken to flush data to the database for this counter group. |
| 4 | Flush Keys | 0 | 0 | VT_COUNTER | keys | This meter reports the number of keys written out during flush operations for this counter group. |
| 5 | New Keys | 0 | 0 | VT_COUNTER | hits | This meter reports the number of new keys created for this counter group within the collection interval. |
| 6 | Key Hits | 0 | 0 | VT_COUNTER | hits | This is an internal metric and can be ignored. |
| 7 | Unique Keys | 0 | 0 | VT_COUNTER | keys | This meter reports the number of distinct keys currently tracked for this counter group. |
| 8 | Heap mem | 0 | 0 | VT_COUNTER | B | This is an internal metric and can be ignored. |
| 9 | Tail Prunes | 0 | 0 | VT_COUNTER | hits | This is an internal metric and can be ignored. |
| 10 | Hi Water Rej | 0 | 0 | VT_COUNTER | hits | This meter reports rejections that occur when this counter group is operating in fixed hi water mode, where only a fixed number of unique keys are accepted in any one minute window. This behavior can be adjusted using the corresponding hi water and memcap policy settings. |
| 11 | Unused Cardinality counter | 20 | 20 | VT_GAUGE | Uniques | This is a reserved gauge slot intended for a unique value cardinality metric. It is not currently mapped to any field for this counter group, so it remains an inactive placeholder with no data populated. |
| 12 | Unused Cardinality counter | 20 | 20 | VT_GAUGE | Uniques | This is a second reserved cardinality gauge slot with the same status as meter 11. It is inactive and not instrumented for this group. |