---

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.

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Span Hierarchy

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

Usage

Copyconst e2e = tracker.startE2E('liq');

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

e2e.complete({ success: true });

Alert Thresholds