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minor wording updates 

Signed-off-by: schou <pschou@users.noreply.github.com>
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schou 2021-02-22 02:39:03 -05:00
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# Disabled Features
Here is a list of features that are disabled by default since they are breaking changes or are considered experimental.
Their behaviour can change in future releases which will be communicated via the [release changelog](https://github.com/prometheus/prometheus/blob/master/CHANGELOG.md).
These features are disabled by default since they are breaking changes or are
considered experimental. As their behavior may change in future releases,
all feature changes are communicated via the [release
changelog](https://github.com/prometheus/prometheus/blob/master/CHANGELOG.md).
You can enable them using the `--enable-feature` flag with a comma separated list of features.
They may be enabled by default in future versions.
One can enable one or more features using the `--enable-feature` flag with a
single feature or a comma-separated list of features. In future releases,
features may be enabled by default.
## `@` Modifier in PromQL
`--enable-feature=promql-at-modifier`
The `@` modifier lets you specify the evaluation time for instant vector selectors,
range vector selectors, and subqueries. More details can be found [here](querying/basics.md#modifier).
The `@` modifier lets one specify the evaluation time for instant vector
selectors, range vector selectors, and subqueries. More details can be found
[here](querying/basics.md#-modifier).
## Negative offset in PromQL
`--enable-feature=promql-negative-offset`
In contrast to the positive offset modifier, the negative offset modifier lets one shift a vector into the past. An example in which one may want to use a negative offset is: when reviewing past data and making temporal comparisons with more recent data. More details can be found [here](querying/basics.md#offset-modifier).
In contrast to the positive offset modifier, the negative offset modifier lets
one shift a vector into the past. An example in which one may want to use a
negative offset is reviewing past data and making temporal comparisons with
more recent data.
More details can be found [here](querying/basics.md#offset-modifier).
## Remote Write Receiver

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docs/querying/basics.md
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rate(http_requests_total[5m] offset -1w)
This negative offset is disabled by default since it breaks the invariant
that PromQL does not look ahead of the evaluation time for samples. This
feature is enabled by setting `--enable-feature=promql-negative-offset`
flag. See [disabled features](../disabled_features.md) for more details
about this flag.
This negative offset has been disabled by default since it breaks the invariant
that PromQL does not look ahead of the evaluation time for samples. This feature
is enabled by setting `--enable-feature=promql-negative-offset` flag. See
[disabled features](../disabled_features.md) for more details about this flag.
### @ modifier