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docs: explain motivation behind having -downsampling.period on vmselect (#5205)

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Signed-off-by: hagen1778 <roman@victoriametrics.com>
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README.md
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@ -739,7 +739,13 @@ See how to request a free trial license [here](https://victoriametrics.com/produ
## Downsampling
Downsampling is available in [enterprise version of VictoriaMetrics](https://docs.victoriametrics.com/enterprise.html). It is configured with `-downsampling.period` command-line flag. The same flag value must be passed to both `vmstorage` and `vmselect` nodes. See [these docs](https://docs.victoriametrics.com/#downsampling) for details.
[Downsampling](https://docs.victoriametrics.com/#downsampling) is available in [enterprise version of VictoriaMetrics](https://docs.victoriametrics.com/enterprise.html).
It is configured with `-downsampling.period` command-line flag. The same flag value must be passed to both `vmstorage`
and `vmselect` nodes. Configuring `vmselect` node with `-downsampling.period` command-line flag makes query results more
consistent, as `vmselect` will evenly downsample all received data samples if requested time range will intersect with configured
`-downsampling.period`. For example, if `-downsampling.period=30d:5m` and user requests `60d` of data then vmselect will downsample
all datapoints (newer and older than `30d`) to `5m` intervals. If this flag is omitted for `vmselect`,
then query results can be less consistent because of mixing raw and downsampled data.
Enterprise binaries can be downloaded and evaluated for free from [the releases page](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest).
See how to request a free trial license [here](https://victoriametrics.com/products/enterprise/trial/).

8
docs/Cluster-VictoriaMetrics.md
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@ -750,7 +750,13 @@ See how to request a free trial license [here](https://victoriametrics.com/produ
## Downsampling
Downsampling is available in [enterprise version of VictoriaMetrics](https://docs.victoriametrics.com/enterprise.html). It is configured with `-downsampling.period` command-line flag. The same flag value must be passed to both `vmstorage` and `vmselect` nodes. See [these docs](https://docs.victoriametrics.com/#downsampling) for details.
[Downsampling](https://docs.victoriametrics.com/#downsampling) is available in [enterprise version of VictoriaMetrics](https://docs.victoriametrics.com/enterprise.html).
It is configured with `-downsampling.period` command-line flag. The same flag value must be passed to both `vmstorage`
and `vmselect` nodes. Configuring `vmselect` node with `-downsampling.period` command-line flag makes query results more
consistent, as `vmselect` will evenly downsample all received data samples if requested time range will intersect with configured
`-downsampling.period`. For example, if `-downsampling.period=30d:5m` and user requests `60d` of data then vmselect will downsample
all datapoints (newer and older than `30d`) to `5m` intervals. If this flag is omitted for `vmselect`,
then query results can be less consistent because of mixing raw and downsampled data.
Enterprise binaries can be downloaded and evaluated for free from [the releases page](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/latest).
See how to request a free trial license [here](https://victoriametrics.com/products/enterprise/trial/).