2025-08 Monthly Summary for matter-labs/zksync-os-server. This month focused on stabilizing L1 watchers, enabling basic Validium data availability support, enhancing observability for batcher/execution, and strengthening test infrastructure to improve reliability and release confidence. Key outcomes: - L1 Watchers Reliability and Stabilization: fixed off-by-one in batch number calculation, robust handling of commit/execute watchers, and a controlled fail-fast path (temporary disable) to halt execution during issues, reducing the risk of cascading failures. - Validium Mode Support: added basic support for Validium data availability mode with differentiated data handling and the ability to commit batches in either Rollup or Validium modes, increasing deployment flexibility. - Observability Enhancements for Batcher and Execution: introduced periodic state reporting, expanded metrics and logging, replaced the old state tracker with a dedicated reporter, and added tracking for timeout seal criteria in the batcher to improve operational visibility and alerting. - Test Infrastructure and Integration Test Improvements: integrated zksync_os_object_store into integration tester and improved error handling/logging to stabilize tests, improving CI reliability and test coverage. Overall impact and accomplishments: - Improved reliability and resilience of batch processing pipelines (watchers and batcher execution). - Increased deployment flexibility with Validium-mode data availability support. - Enhanced operational visibility enabling faster issue detection and faster MTTR. - Strengthened testing foundation, leading to more stable releases and reduced flaky tests. Technologies/skills demonstrated: - Observability: metrics, reporting, histogram and counter expansions, enhanced logging. - Reliability engineering: bug fixes in watchers, fail-fast control, stability improvements. - Data-path flexibility: Validium vs Rollup data handling. - Test infrastructure: integration test enhancements and error-handling improvements. Commits of note: - L1 Watchers: 2bd5878, 53976e09, 99bdfbc6 - Validium: 73fc1d11 - Observability: 3b205135, 686cc12c, b1368224 - Tests: 7492916158aa8e96

July 2025 monthly performance summary for matter-labs/zksync-os-server. Delivered user-focused configurability and documentation for the Prover API, centralized visibility through a GeneralMetrics consolidation for sequencer KPIs, a Docker packaging path fix to ensure reliable module resolution, and an automated staging deployment workflow via GitHub Actions to a Google Cloud VM. These efforts improve configurability, observability, deployment reliability, and efficiency in pushing changes to staging and production.

June 2025 monthly summary for matter-labs/zksync-era: Maintained API stability by rolling back Fast Finality-related API changes to restore backward compatibility and enable deployment of the remaining 28.3.0 changes. Focused on preserving client integrations while advancing release readiness.

Month: 2025-01 — Focused on observability improvements for Eth-Watcher in matter-labs/zksync-era, delivering targeted monitoring enhancements and reducing alert fatigue. By correcting alert logic to trigger only when there are no successful iterations for a defined duration, monitoring accuracy and incident response readiness were strengthened.