demo/grafana: pure-wire latency panel + clearer latency info tips (both boards)#24
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armcconnell wants to merge 1 commit into
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demo/grafana: pure-wire latency panel + clearer latency info tips (both boards)#24armcconnell wants to merge 1 commit into
armcconnell wants to merge 1 commit into
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… (both boards) Adds a 'Wire latency (publisher->recv, network only)' timeseries (p50/p95/p99 of send_latency_ms) to both the Top-of-Book and Market-by-Order dashboards, so the network/transport number is separated from the venue->publisher ingest lag that dominates source->recv. Also fills in/clarifies panel descriptions, with the latency tips made explicit: send->recv = pure wire (kernel-stamped recv), source->recv = wire + block->emit ingest lag. Mirrored identically across both boards.
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Summary
Adds a Wire latency (publisher→recv, network only) timeseries panel (p50/p95/p99 of
send_latency_ms) to both dashboards, and sharpens the latency panel descriptions.Motivation:
source→recvis dominated by the venue→publisher ingest lag (block→emit), which can tail to seconds and is not network.send→recv(recv_ts − publisher_send_ts, kernel-stamped viaSO_TIMESTAMPNS) isolates pure transport. The new panel surfaces that directly.Confirmed live: TOB wire ≈ 68/69/70 ms (flat); MBO wire ≈ 78/210/274 ms (the p99 bump is publisher-side burst serialization at block boundaries) — both far below the source→recv ingest figures.
Changes
topofbookandmarketbyorderboards (identical except the source table).Docs/dashboard-only; no code or schema change.