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Document feature flag 'created-timestamp-zero-ingestion' (#13279)

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Signed-off-by: Arthur Silva Sens <arthur.sens@coralogix.com>
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docs/feature_flags.md
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@ -194,3 +194,13 @@ won't work when you push OTLP metrics.
Enables PromQL functions that are considered experimental and whose name or
semantics could change.
## Created Timestamps Zero Injection
`--enable-feature=created-timestamp-zero-ingestion`
Enables ingestion of created timestamp. Created timestamps are injected as 0 valued samples when appropriate. See [PromCon talk](https://youtu.be/nWf0BfQ5EEA) for details.
Currently Prometheus supports created timestamps only on the traditional Prometheus Protobuf protocol (WIP for other protocols). As a result, when enabling this feature, the Prometheus protobuf scrape protocol will be prioritized (See `scrape_config.scrape_protocols` settings for more details).
Besides enabling this feature in Prometheus, created timestamps need to be exposed by the application being scraped.