majiayu000 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
Per-call and aggregated latency tracking for MEV infrastructure.
When to Use
- Implementing performance monitoring
- Debugging slow operations
- Adding instrumentation to code paths
- Tracking end-to-end latency
- Setting up alerting thresholds
Workflow
Step 1: Define Span Hierarchy
Structure spans from e2e_flow down to individual calls.
Step 2: Instrument Code
Wrap operations in tracker.span() calls.
Step 3: Set Alert Thresholds
Configure alerts for latency exceeding expected ranges.
Span Hierarchy
e2e_flow (root) ├── rust_hotpath_call (5-15ms) │ └── rpc_eth_call (5-20ms) ├── tx_submit └── tx_confirm (1-15s)
Usage
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 |