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docs/CHANGELOG.md: do not mention reduction in query duration
There was a signficant refactoring in the code responsible for time series search, so it can result in both speed ups and slow downs depending on used queries.
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- `histogram_avg(buckets)` - returns the average value for the given buckets.
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- `histogram_avg(buckets)` - returns the average value for the given buckets.
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- `histogram_stdvar(buckets)` - returns standard variance for the given buckets.
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- `histogram_stdvar(buckets)` - returns standard variance for the given buckets.
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- `histogram_stddev(buckets)` - returns standard deviation for the given buckets.
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- `histogram_stddev(buckets)` - returns standard deviation for the given buckets.
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* FEATURE: reduce median query duration by up to 2x. See https://github.com/VictoriaMetrics/VictoriaMetrics/commit/18fe0ff14bc78860c5569e2b70de1db78fac61be
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* FEATURE: export `vm_available_memory_bytes` and `vm_available_cpu_cores` metrics, which show the number of available RAM and available CPU cores for VictoriaMetrics apps.
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* FEATURE: export `vm_available_memory_bytes` and `vm_available_cpu_cores` metrics, which show the number of available RAM and available CPU cores for VictoriaMetrics apps.
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* FEATURE: export `vm_index_search_duration_seconds` histogram, which can be used for troubleshooting time series search performance.
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* FEATURE: export `vm_index_search_duration_seconds` histogram, which can be used for troubleshooting time series search performance.
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* FEATURE: vmagent: add ability to replicate scrape targets among `vmagent` instances in the cluster with `-promscrape.cluster.replicationFactor` command-line flag. See [these docs](https://victoriametrics.github.io/vmagent.html#scraping-big-number-of-targets).
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* FEATURE: vmagent: add ability to replicate scrape targets among `vmagent` instances in the cluster with `-promscrape.cluster.replicationFactor` command-line flag. See [these docs](https://victoriametrics.github.io/vmagent.html#scraping-big-number-of-targets).
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