Major Description
Today most of the client latency metrics are measured in millis, and some in nanos. For those measured in nanos we usually differentiate them by having a `-ns` suffix in the metric names, e.g. `io-wait-time-ns-avg` and `io-time-ns-avg`. But there are a few that we obviously forgot to follow this pattern, e.g. `io-wait-time-total`: it is inconsistent where `avg` has `-ns` suffix and `total` has not. I did a quick search and found just three of them:
- bufferpool-wait-time-total -> bufferpool-wait-time-ns-total
- io-wait-time-total -> io-wait-time-ns-total
- iotime-total -> io-time-ns-total (note that there are two inconsistencies on naming, the average metric is `io-time-ns-avg` whereas total is `iotime-total`, I suggest we use `io-time` instead of `iotime` for both).
We should change their name accordingly with the `-ns` suffix as well.
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