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42 lines
1.4 KiB
Markdown
42 lines
1.4 KiB
Markdown
---
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title: Disabled Features
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sort_rank: 10
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---
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# Disabled Features
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These features are disabled by default since they are breaking changes or are
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considered experimental. As their behavior may change in future releases,
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all feature changes are communicated via the [release
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changelog](https://github.com/prometheus/prometheus/blob/master/CHANGELOG.md).
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One can enable one or more features using the `--enable-feature` flag with a
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single feature or a comma-separated list of features. In future releases,
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features may be enabled by default.
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## `@` Modifier in PromQL
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`--enable-feature=promql-at-modifier`
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The `@` modifier lets one specify the evaluation time for instant vector
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selectors, range vector selectors, and subqueries. More details can be found
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[here](querying/basics.md#-modifier).
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## Negative offset in PromQL
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`--enable-feature=promql-negative-offset`
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In contrast to the positive offset modifier, the negative offset modifier lets
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one shift a vector into the past. An example in which one may want to use a
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negative offset is reviewing past data and making temporal comparisons with
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more recent data.
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More details can be found [here](querying/basics.md#offset-modifier).
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## Remote Write Receiver
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`--enable-feature=remote-write-receiver`
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The remote write receiver allows Prometheus to accept remote write requests from other Prometheus servers. More details can be found [here](storage.md#overview).
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