Month: 2026-04 — MetaMask/core: Focused on reliability improvements in the assets-controller update pipeline. Delivered a bug fix that hardens error handling in subscription and polling callbacks to prevent rejection cascades, maintains stable polling ticks, and improves overall resilience. Changes guard onActiveChainsUpdated in AssetsController and wrap balance/detection/staked-balance update handlers in RpcDataSource and StakedBalanceDataSource to prevent uncaught exceptions from breaking polling loops. Commit referenced: 23c22bdda5f17389a2fd57f44aeb5d462a3a72cd. This work reduces downtime, improves user experience, and lays groundwork for robust error visibility and maintainability.

March 2026 performance highlights: Cross-repo observability uplift across core, mobile, and extension. Telemetry migrated from MetaMetrics to Sentry for initial-fetch, with first-init timing reported via trace callbacks and per-data-source latency tracking added to asset loading. Core monorepo upgraded to 870.0.0 with corresponding package bumps and lockfile updates. Tests and docs updated to reflect new telemetry contracts and dependencies. Result: improved reliability, faster issue triage, and actionable performance insights for asset loading across platforms.

February 2026 monthly summary for MetaMask/core. Delivered significant feature revamps, improved data source resilience, and stabilized backend dependencies, resulting in enhanced asset visibility control, more reliable balance retrieval, and lower release risk.

January 2026 (2026-01) — MetaMask/core delivered a backend upgrade and asset-management enhancements to improve performance, reliability, and cross-chain support. Key outcomes include a unified backend API client with caching and retries, a middleware-based AssetsController enabling multi-chain asset workflows, and metadata enhancements aligned with Tokens API v3. Critical bug fixes improved stability and token handling.

In 2025-12, MetaMask/core delivered automatic token balance refresh on account changes and address normalization for balance fetching. The TokenBalancesController now fetches balances when the selected EVM account changes, and addresses are normalized to lowercase to ensure correct balance lookups. Tests were updated, and the coverage threshold adjusted to reflect the new balance-fetch workflow. This work improves data accuracy, user experience, and reliability for balance-related UX and wallet operations. Commit reference highlights include 0379cb76e5d22212fd963fea9f8877f845ac3b17 with message fix(TokenBalancesController): fetch balances on account change (#7279).

Month 2025-11 Summary: Strengthened real-time WebSocket reliability and stability across MetaMask/core, MetaMask/metamask-mobile, and MetaMask/metamask-extension. Delivered observable WebSocket lifecycle, reduced flaky tests, and upgraded core dependencies to streamline configuration. These changes improve business value by delivering more reliable real-time updates to users, faster feedback from CI, and simpler, more maintainable deployment configurations.

October 2025 performance summary: Delivered real-time data capabilities and hygiene improvements across MetaMask/core and metamask-extension, enabling faster feature delivery and greater reliability for users. Key outcomes include a WebSocket-based core-backend with real-time activity and balance updates, lifecycle management, performance tracing, and robust reconnection handling, along with targeted fixes to race conditions and reconnection logic. Release/versioning hygiene across the monorepo improved tag consistency and release metadata, and test stability for BackendWebSocketService was enhanced by making backoff deterministic. In the extension, core-backend upgrade to 3.0.0 modernized the WebSocket service API and aligned dependencies, setting the stage for simpler future upgrades and policy compliance.

September 2025 Monthly Summary – MetaMask/core Overview: Delivered a performance-focused enhancement to TokenBalances polling that optimizes per-network behavior by making polling intervals adaptive based on per-chain dynamics and WebSocket connectivity, with an opt-in, backward-compatible design. The update includes an assets-controllers package upgrade (74.3.3) with changelog and yarn.lock updates, and aligns with the 534.0.0 release cycle.