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docs/CHANGELOG.md: cut v1.72.0

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Aliaksandr Valialkin 2022-01-18 22:43:18 +02:00
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## tip
## [v1.72.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.72.0)
Released at 18-01-2022
* FEATURE: [MetricsQL](https://docs.victoriametrics.com/MetricsQL.html): add support for `@` modifier, which is enabled by default in Prometheus starting from [Prometheus v2.33.0](https://github.com/prometheus/prometheus/pull/10121). See [these docs](https://prometheus.io/docs/prometheus/latest/querying/basics/#modifier) and [this feature request](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1348). VictoriaMetrics extends `@` modifier with the following additional features:
* It can contain arbitrary expression. For example, `foo @ (end() - 1h)` would return `foo` value at `end - 1 hour` timestamp on the selected time range `[start ... end]`. Another example: `foo @ now() - 10m` would return `foo` value 10 minutes ago from the current time.
* It can be put everywhere in the query. For example, `sum(foo) @ start()` would calculate `sum(foo)` at `start` timestamp on the selected time range `[start ... end]`.