docs/CHANGELOG.md: cut v1.64.0

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Aliaksandr Valialkin 2021-08-15 23:52:03 +03:00
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## tip
## [v1.64.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.64.0)
* FEATURE: add support for Prometheus staleness markers. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1526).
* FEATURE: vmagent: automatically generate Prometheus staleness markers for the scraped metrics when scrape targets disappear in the same way as Prometheus does. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1526).
* FEATURE: add `present_over_time(m[d])` function, which returns 1 if `m` has a least a single sample over the previous duration `d`. This function has been added also to [Prometheus 2.29](https://github.com/prometheus/prometheus/releases/tag/v2.29.0-rc.0).