fix(metrics): attribute simulation fetches

[thlorenz]

Summary

Attribute account fetches needed to simulate a transaction to a dedicated simulate_transaction metrics entrypoint rather than send_transaction.

Details

Simulation account ensuring now preserves its own request origin through the existing account-fetch context. This separates simulation-driven fetch, clone, pending-work, and companion-fetch observability from submitted transactions without changing transaction preparation, account ordering, primary-mode checks, replay handling, or simulation responses.

The new entrypoint is a static, bounded Prometheus label value. Transaction signatures remain tracing-only and are not labels.

Example PromQL for simulation-owned fetch activity over five minutes:

sum by (layer, outcome) (
  increase(chainlink_pending_fetch_accounts_total{
    entrypoint="simulate_transaction",
    fetch_reason="requested_account"
  }[5m])
)

The change adds metrics-level coverage and Aperture simulation tests to verify the new attribution while retaining existing send-transaction behavior.

Summary by CodeRabbit

• Bug Fixes
  • Improved simulateTransaction account and ledger fetching by using the correct request context.
  • Simulation requests now report accurate fetch metrics and remote-account claim counts.
  • Added clearer tracking of simulated transaction activity in monitoring data.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: 21cb6c0b-a35b-4254-ba51-7c4d89134ae7

📥 Commits

Reviewing files that changed from the base of the PR and between 2ac3bea and 4ce35f0.

📒 Files selected for processing (4)

• magicblock-aperture/src/requests/http/mod.rs
• magicblock-aperture/src/requests/http/simulate_transaction.rs
• magicblock-metrics/src/metrics/mod.rs
• magicblock-metrics/src/metrics/types.rs

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📝 Walkthrough

Walkthrough

Adds a SimulateTransaction account-fetch entrypoint and context constructor, including signature access, remote-account claim counting, labels, and tests. Updates HTTP simulation handling to use the simulation-specific context and extends metric tests for its labels.

Suggested reviewers: gabrielepicco, taco-paco

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch thlorenz/rate-limit+simulate-origin

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[chatgpt-codex-connector]

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