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Implementing Derivative using linear regression #137142

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@pabloem pabloem commented Oct 25, 2025 •
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  • Implements a one-pass simple linear regression algorithm for time-series (x-long, y-double)
  • Implements per-type specializations that simply cast to double.
  • Returns the slope of the linreg as the derivative

Implementation of https://prometheus.io/docs/prometheus/latest/querying/functions/#deriv

@pabloem pabloem marked this pull request as ready for review October 27, 2025 18:26
@pabloem pabloem changed the title [wip] Initial steps of implementing Derivative using linear regression Implementing Derivative using linear regression Oct 27, 2025
@pabloem pabloem requested a review from dnhatn October 27, 2025 18:26
@elasticsearchmachine elasticsearchmachine added the needs:triage Requires assignment of a team area label label Oct 27, 2025
@pabloem pabloem added >feature :StorageEngine/TSDB You know, for Metrics Team:StorageEngine and removed needs:triage Requires assignment of a team area label labels Oct 27, 2025
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Pinging @elastic/es-storage-engine (Team:StorageEngine)

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@dnhatn dnhatn Awaiting requested review from dnhatn

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>feature :StorageEngine/TSDB You know, for Metrics Team:StorageEngine v9.3.0

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