Extract reusable classes from flow metrics#18502

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andsel wants to merge 10 commits intoelastic:mainfrom

andsel:fix/extract_resusable_classes_from_flowmetrics

Commits on Dec 17, 2025

Introduced common base class to group all kind of data that can be used to compute a flow metric.
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Extracted flow metric's RetentionWindow in its own class
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Moved selectNewerCapture to newly created DatapointCapture
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Commits on Jan 15, 2026