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docs/MetricsQL.md: document first_over_time and last_over_time functions

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Aliaksandr Valialkin 2020-05-02 22:43:29 +03:00
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@ -110,3 +110,5 @@ This functionality can be tried at [an editable Grafana dashboard](http://play-g
would calculate `min_over_time`, `max_over_time` and `rate` for `m[d]`.
- `hoeffding_bound_upper(phi, m[d])` and `hoeffding_bound_lower(phi, m[d])` - return upper and lower [Hoeffding bounds](https://en.wikipedia.org/wiki/Hoeffding%27s_inequality)
for the given `phi` in the range `[0..1]`.
- `last_over_time(m[d])` - returns the last value for `m` on the time range `d`.
- `first_over_time(m[d])` - returns the first value for `m` on the time range `d`.