# Latency Tracker

> Per-call and aggregated latency tracking for MEV infrastructure. Use when implementing performance monitoring or debugging slow operations. Triggers on: latency, timing, performance, slow, speed, inst

- Skill: `majiayu000/latency-tracker-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/latency-tracker-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/latency-tracker-2/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/majiayu000/latency-tracker-2

---


---
name: latency-tracker
description: Per-call and aggregated latency tracking for MEV infrastructure. Use when implementing performance monitoring or debugging slow operations. Triggers on: latency, timing, performance, slow, speed, instrumentation.
---

# Latency Tracker

## Span Hierarchy
e2e_flow (root)
├── rust_hotpath_call (5-15ms)
│   └── rpc_eth_call (5-20ms)
├── tx_submit
└── tx_confirm (1-15s)

## Usage
```typescript
const e2e = tracker.startE2E('liq');

await e2e.span('rust_call', async () => {
  return await callRust();
});

e2e.complete({ success: true });
```

## Alert Thresholds

| Span | Expected | Alert |
|------|----------|-------|
| rust_hotpath | 5-15ms | >30ms |
| rpc_eth_call | 5-20ms | >50ms |
| e2e_to_submit | 10-50ms | >100ms |