feat(mempool): add pre-slot timing filter and transaction age analysis #40
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Improve mempool visibility analysis with three key enhancements: 1. Pre-slot temporal filtering: Only count transactions as "seen" if they were observed in the mempool BEFORE the slot start time of the block that included them. This corrects for transactions that appear in the mempool after block propagation. 2. Three-way transaction categorization: - seen_before_slot: Available in mempool before inclusion (public) - seen_after_slot: First appeared after block propagation - never_seen: Truly private (MEV bundles, direct builder submissions) 3. Age/delay percentile analysis: - age_percentiles_ms: How long transactions waited in mempool (p50-p99) - delay_percentiles_ms: Propagation delay for post-slot observations The new fetch_mempool_availability query aggregates per-slot, per-tx-type with efficient quantilesIf() computation. Notebook visualizations updated to show stacked breakdowns and percentile distributions.
Preview Deployment🚀 Preview is ready! URL: https://observatory-staging.ethp2p.dev/pr-40/ Updated: 2026-01-10T11:41:09.959Z |
Add binned histogram visualization alongside percentile analysis: - 15 log2 buckets from <0.5s to >=1h for both age and delay metrics - Faceted bar charts showing distribution per transaction type - Consistent color scheme (TX_TYPE_COLORS) across all visualizations - Replaced grouped bar charts with percentile line charts Query changes: - Generate histogram columns dynamically using countIf - Buckets: <0.5s, 0.5-1s, 1-2s, 2-4s, 4-8s, 8-16s, 16-32s, 32s-1m, 1-2m, 2-4m, 4-8m, 8-17m, 17-34m, 34-60m, >=1h The histograms reveal distribution shape (where most transactions cluster) while percentile lines show tail behavior for SLA analysis.
…plots Faceted subplots with shared y-axes made smaller tx types hard to read. Grouped bar charts show all tx types side-by-side on the same scale, making distribution comparisons easier.
Log scale better shows the range of values across percentiles, especially when p99 is orders of magnitude larger than p50.
Each tx type now has its own y-scale, making distribution shapes visible regardless of absolute transaction counts.
Add facet_col_wrap=2 to age and delay histograms for better layout on narrow screens. Increase chart height to 600 to accommodate the 3-row facet layout (5 tx types / 2 cols).
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Summary
Changes
New query:
fetch_mempool_availabilityquantilesIf()for efficient percentile computationUpdated notebook:
04-mempool-visibility.ipynbTest plan