corrected a mistake in documentation

docs/monitoring.md

@@ -557,7 +557,7 @@ From the whole sample period (1s), the VM has been 0.9s in state 'placed'. Hence
 the VM has been reported to be in state __placing__. Since it has exited state __placing__, the total time spent in this state (9.3s + 0.1s = 9.4s) is reported.
 This includes the state time from previous reports. The mean state time value for __placing__ is the same as the sum value because the VM has only been once in this state.
 
-| global tags | current_state (tag) | current_state_time (tag) | unplaced_sum | unplaced_mst | placing_sum | placing_mst | placed_sum | placed_mst | booting_sum | booting_mst | booted_sum | booted_mst | connecting_sum | connecting_mst | connected_sum | connected_mst | time |
+| global tags | current_state (tag) | current_state_time | unplaced_sum | unplaced_mst | placing_sum | placing_mst | placed_sum | placed_mst | booting_sum | booting_mst | booted_sum | booted_mst | connecting_sum | connecting_mst | connected_sum | connected_mst | time |
 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
 | ... | placing | 0.3 | 0.7 | 0.7 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ... |
 | ... | placing | 1.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ... |