Measure average batch byte size and event count#18000

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andsel wants to merge 16 commits intoelastic:mainfrom

andsel:feature/average_metric_byte_size_event_count

Commits on Aug 18, 2025

Instantiated metric 'pipelines.<pipeline id>.batch.count' to count number of matches to compure the average events and byte per batch
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Exposed just the lifetime value for a flow metric computed using total in events divided by number of batches
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Commits on Aug 20, 2025

[Test] added integration test to verify monitoring API return expected batch subtree metrics
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Introduced 'pipeline.batch.metrics' to manage the way queue reader client can collect batch metrics related to byte size and event count, this commit spread the setting and parameter around doesn't…
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