Add streaming precompute engine: sketch-based windowed aggregation over Prometheus/VictoriaMetrics remote write#162

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zzylol wants to merge 38 commits intomainfrom

156-discussion-requirements-and-design-choices-for-a-sketch-based-streaming-pre-compute

Commits on Mar 9, 2026

Add standalone precompute engine to replace Arroyo streaming pipeline

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Restore standalone precompute engine binary with fixed imports

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Wire up DatasketchesKLL in accumulator factory and add E2E test

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Add raw-only mode to PrecomputeEngine that skips aggregation

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Add debug-level tracing spans for e2e latency measurement in precompute engine

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Add 1000-sample batch latency test to E2E precompute test

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Add 10M-sample throughput test to E2E precompute test

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update
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Fix sliding window aggregation: feed samples into all overlapping windows

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Add late data handling for closed windows and precompute engine design doc

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Minor wording fix in precompute engine design doc

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Clarify single-machine multi-threaded architecture in design doc

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Add multi-connector ingest support (Prometheus + VictoriaMetrics)

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Run cargo fmt

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Add pane-based incremental sliding window computation

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Add windowed aggregation benchmarks and fix build issues

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Add scalability benchmark varying worker count (1-16)

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Make throughput test multi-threaded for data generation and sending

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Increase throughput test drain timeout from 60s to 120s

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Fix PR405 reorg integration for ingest decode and config APIs
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Fix precompute engine clippy warnings
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Fix clippy lints in test_e2e_precompute
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update
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Add CapturingOutputSink and worker correctness unit tests

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Update precompute engine design doc

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doc: explain sliding window behaviour with cross-worker GROUP BY

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doc: document accumulator lifecycle and ownership in worker section

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doc: document load balancing trade-offs and alternatives for SeriesRouter

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Fix misleading WindowManager struct comment

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doc: add fault tolerance TODO section; fix rustfmt formatting in worker tests

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Fix Clippy len_without_is_empty warning
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test: add worker test that loads aggregation config from streaming_config YAML

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