April 2026 monthly summary for Longhorn engineering. The team delivered significant feature work, strengthened test reliability, modernized CI/CD pipelines, and advanced engine management capabilities across three repositories. Key features delivered and major improvements: - longhorn-tests: Developer Documentation Enhancements for v2 data engine testing commands — README updated to include new commands for v2 data engine tests, improving developer onboarding and test reproducibility. Commit: 1e719f7c6bca34a1edec99c301cc5642a0f15f3f. - longhorn-tests: CI/CD pipeline modernization with Docker validation — migrated validation process from Dapper to Docker, simplifying maintenance and improving consistency of test runs. Commit: 7da02367030cd175ad71f31135b5049112d5b046. - longhorn-manager: CI/CD Pipeline Modernization — removed Dapper, updated workflow configurations, added COPILOT guidance and PR handling improvements to align with PR targets. Commits: 00ca05fbeb38efc9d21e10d7c65e528db745934e, 2f58b74f89eb932b3b4ea43bdcfc57c434bfebda, 18b99e6f55fd301c084a61868cadb56d0de89215, 82e57cc3646eed3c9590af117ae76ea7daa7ee69. - longhorn-instance-manager: Build system and CI workflow consistency — aligned Dockerfile and Makefile across repos to improve build reliability and CI performance. Commit: 063eb225db29f977c4aa9ceb859184a89d5e02a4. - longhorn-instance-manager: Dependency updates and improved NVMe/TCP retry — updated vendor dependencies to enable robust retry behavior and compatibility. Commits: 7eb94d4f7bda0d94a3019a094c68c5a8b721d8e7, 3aebbeb2b3ed328478174c2efee0fce47b5a02c8. - longhorn-instance-manager: Separate engine frontend management — introduced support for separating the engine frontend for improved management of engine frontends. Commit: e2e543eaa59954ce88081ba17560d5e6a09712ae. - longhorn-instance-manager: Phase-aware switchover coordination — added switchoverPhase parameter to enable phase-aware coordination between longhorn-manager and longhorn-spdk-engine. Commit: f2f06b49e43a4cc9d271ba0f290c9e8396fea86b. Major bugs fixed: - Test stability: Addressed flakiness in the volume expansion test when the node disk is full by introducing a wait for disk status updates and increasing the integration test retry limits. Commits: 1d1fd4fdaa57b18dfe4d6b56ca57cb69df5abada, c6b23360df6062d33ab43b8328d51cc246d239bd. Overall impact and accomplishments: - Accelerated developer productivity through clearer documentation, more reliable test results, and streamlined CI/CD pipelines. - Strengthened system reliability and maintainability with consistent build tooling, updated dependencies, and enhanced engine management features. - Delivered architectural enhancements enabling more robust engine frontend handling and phase-aware coordination, aligning with long-term scalability goals. Technologies/skills demonstrated: - Documentation excellence and test-command clarity; Git commit hygiene and PR readiness; Docker-based CI/CD and workflow modernization; vendor dependency management; NVMe/TCP retry strategies; gRPC client integration; engine frontend separation; phase-aware orchestration.

March 2026 highlights: Delivered reliability, security, and maintainability improvements across Longhorn repositories. Key features included a guard against NPEs in metrics collection, and CI workflow improvements to trigger on pull requests. Expanded testing coverage and documentation for the v2 data engine, and modernized the Longhorn Instance Manager CI/CD/build process. These changes reduce production risk, accelerate PR verification, and improve cross-repo consistency. Business impact: Reduced incident surface in metrics collection, faster and safer PR validation, broader test coverage for the v2 data engine, and streamlined CI/CD workflows enabling more frequent, safer releases.

February 2026 monthly summary for longhorn/longhorn-instance-manager: stability-focused work through core dependency upgrades (go-spdk-helper and longhorn-spdk-engine). These updates improve compatibility, maintainability, and reduce upgrade risk in production, aligning with the project’s reliability goals.

January 2026 monthly summary across core Longhorn repos. The period delivered expanded regression test coverage, core dependency and packaging improvements, and reliability hardening across replica management, backups, and proxies, with strengthened maintenance and compliance automation. The combined effort increases deployment reliability, reduces MTTR for failures, accelerates build pipelines, and enhances security/compliance posture for enterprise deployments.

December 2025 monthly summary for Longhorn core repositories focused on stability, compatibility, and operational readiness. Delivered key features, fixed critical bugs, and advanced testing coverage to reduce risk in production. Business value centers on reliable provisioning, robust backup/restore, and improved configurability, all underpinned by up-to-date dependencies and better developer tooling.

Month: 2025-11 — Monthly summary for Longhorn development Key features delivered - Engine Image Deployment Reliability (Longhorn Manager): Re-enabled engine image deployment and default image checks, restoring support for backup operations across v1 data engine configurations. This avoided the previous regression and ensures data protection workflows continue to function without engine-image-related gaps. - Pod Blacklist for Automatic Deletion on Volume Detach: Introduced and refined a blacklist-based auto-delete policy for workload pods when volumes detach unexpectedly; safeguards deletion by ensuring the pod’s controller is not blacklisted, improving safety and usability. - Kubernetes CRD/Tooling Maintenance and Compatibility: Updated CRDs, API versions, annotations, and tooling; regenerated codes; upgraded toolchains; replaced deprecated packages to maintain Kubernetes and Longhorn compatibility and reduce technical debt. - Go Context Import Modernization (Longhorn Instance Manager): Replaced deprecated context import with standard context, improving maintainability and future-proofing of Go code. - Docker Image Security Hygiene: Removed Windows installer executables (*.exe) from Docker images to reduce false positives in vulnerability scans and strengthen security posture. Major bugs fixed - Engine Image Deployment Reliability (Longhorn Manager): Restore engine image deployment and checks to support backup operations across v1 data engine configurations; revert changes that disabled engine image deployment. - Instance Manager Context Cancellation Hardened (Longhorn Instance Manager): Address potential context leaks by ensuring proper cancellation in service client methods and gRPC calls, improving resource management and reliability. - Kubernetes CRD/Tooling Maintenance and Compatibility: Maintain compatibility with Kubernetes and Longhorn through CRD/tooling updates, code regeneration, and toolchain upgrades. Overall impact and accomplishments - Improved backup reliability and data protection flows, reduced operational risk from engine-image related regressions, and strengthened security posture by removing unnecessary binaries from Docker images. Enhanced maintainability through Go modernization and updated tooling, and ensured smoother Kubernetes integration across both managers. Technologies/skills demonstrated - Go context modernization and code hygiene; gRPC and service cancellation patterns; Kubernetes CRD tooling, code generation, and toolchain management; security hygiene in container images; release engineering and maintenance.

October 2025 monthly summary for developer work across longhorn-manager and longhorn-instance-manager, focusing on stability, reliability, and maintainability. Delivered concrete fixes and structural improvements to reduce downtime risk, improve error visibility, and streamline future changes. Key delivery included targeted bug fixes, dependency upgrades, and config correctness enhancements that collectively improve production readiness and developer experience.

September 2025 performance summary for Longhorn repositories, focusing on reliability, observability, and data-engine readiness across manager components, with notable maintenance and security cleanups.

August 2025 monthly summary focusing on delivering data-engine governance improvements, reliability enhancements, and developer tooling across Longhorn components. Major work centers on CRD/data engine settings modernization, datastore consolidation, validation enhancements, and upgrade/webhook reliability, with targeted performance and logging improvements to support scalable operations.

July 2025 monthly summary: Delivered automation, stability, and observability improvements across Longhorn manager components. Key features include CI/CD workflow authentication and PR automation improvements using a Longhorn bot and GitHub App tokens (with workflow_dispatch and token substitution). Implemented Kubernetes CRD compatibility cleanup removing preserveUnknownFields and renaming V2DataEngineRebuildingMbytesPerSecond to ReplicaRebuildBandwidthLimit. Enhanced diagnostics by recording the exact scheduling failure reason in volumes' Scheduled condition. Fixed replica cleanup health logic to count only healthy and active replicas. Refactored disk metrics collection to a dedicated collector, removing the DiskMetrics field. Added log rotation in the Longhorn Instance Manager Docker image to stabilize containers and prevent disk space growth. These changes increase security, reliability, and maintainability while delivering concrete business value in faster PR cycles, safer data operations, and improved observability.

June 2025 monthly summary: Delivered key architecture and reliability improvements across Longhorn manager and instance-manager, with a focus on business value, maintainability, and operational stability. Highlights include migrating core resource validation/mutation to admission webhooks for centralized validators/mutators, enhancing troubleshooting for engine images, API cleanup to align CRDs, and substantial CI/CD and build reliability improvements. Key achievements: - Migrated validation/mutation logic for EngineImage, Node, and Replica to admission webhooks, centralizing validators/mutators for consistency and maintainability. Commit: a56819105fd965b73dbc70133e1eb5814d3bea91. - Enhanced engine image troubleshooting by adding granular error reporting for binary checks in engineBinaryChecker and its usage in syncEngineImage. Commit: c65035e66994398af24fadd77c3684e253f72f11. - CRD cleanup: removed deprecated evictionRequested field from ReplicaStatus and updated Go API and client apply configurations. Commit: 16505d0d1aa1f53ead569887271f2eb168a73729. - CI workflow reliability fixes: fetch CRDs from the PR target branch to avoid compatibility issues and fix curl usage to reliably download crds.yaml with proper quoting and fail-on-error handling. Commits: 43e36b45f5b73daf4d19b90633dc15cdaed0abd8; a79573a761d58bad7a2a55e8ca76a8c24b32b07c. - Docker image build reliability: cache busting in Dockerfile to avoid stale dependencies and move libqcow build to dedicated repository (longhorn/libqcow) for centralized dependency management. Commits: fdca8414344fb37a19f688b7e8c3bf5b70dd3779; 8e15bd425cc4dadaa6dc334a3c150dc9ec1f9a54. Overall impact and accomplishments: - Increased CI stability and compatibility between PRs and target branches, reducing flaky checks and onboarding time. - Improved developer productivity through centralized validators, clearer engine image troubleshooting, and API/API client alignment. - More reliable Docker builds with centralized dependency sourcing, decreasing risk of stale dependencies and build failures. Technologies and skills demonstrated: - Kubernetes CRDs and admission webhooks, Go-based validators/mutators, and API design evolution. - CI/CD optimization, including PR-target branch synchronization and robust curl handling. - Dockerfile optimization and multi-repo dependency management (longhorn/libqcow).

May 2025 monthly summary focusing on delivering durable business value through enhanced identity, lifecycle management, observability, and upgrade readiness across Longhorn components. The work delivered UUID-based identity for instances, safer orphan-resource handling, robust snapshot lifecycle, expanded health visibility, and targeted maintenance to modernize dependencies and APIs, strengthening reliability and future-proofing.

Summary for 2025-04 focusing on longhorn-manager and longhorn-instance-manager. Delivered features and reliability improvements with a strong emphasis on business value, streamlined upgrade paths, and enhanced automation across CI/CD.

February 2025-03 monthly summary for Longhorn development. Delivered targeted improvements across core manager, tests, and infra, with an emphasis on reliability, maintainability, and business value. The work emphasizes snapshot integrity, API stability, and build quality, enabling safer upgrades and faster delivery.

February 2025 performance overview: Delivered major build and reliability enhancements across Longhorn components, including centralized dependency version management, SPDK engine robustness, Kubernetes client-go upgrade for CLI stability, LUKS status utilities, and CI workflow improvements. These work streams collectively improve deployment reproducibility, runtime reliability, observability, and developer productivity while reducing operational risk.

January 2025 monthly summary focusing on key achievements and business value across Longhorn components. Key features delivered: - SPDK Engine Upgrade and Robustness Improvements (longhorn-instance-manager): Upgraded SPDK dependencies, vendor updates, and improved replica add/rebuild error handling, plus enhanced backup/status logging and replica deletion behavior tweaks for greater observability and reliability. - CI/CD and Dependency Management Improvements: Centralized dependency versions, updated build environments, and streamlined workflows to ensure consistent, reliable builds across platforms, including ARM64 runners and refreshed repos. - Environment checks and improved logging: Clearer visibility when environment checks are skipped and refined logs to distinguish context cancellations from other errors, aiding faster troubleshooting. - V2 Data Engine status labeling: Updated terminology from Preview to Experimental to better reflect the development stage in the UI and settings. - Kubernetes CRD generation and automation enhancements: CRD generation scripts updated, tool version bumps, and build validation improvements to automate and stabilize CRD updates. Major bugs fixed: - StorageAvailable calculation refinement for disks (longhorn-manager): Truncate only DiskTypeFilesystem (logs/files) disks, preserving accurate storage reporting for block-type disks. - BackupTargetController: Added a mutex to protect bsTimerMap to ensure thread-safety during reconciliation and cleanup, eliminating race conditions. Overall impact and accomplishments: - Significantly improved storage provisioning stability, observability, and data integrity through SPDK upgrades and safer concurrent handling. - Increased release reliability and maintainability via centralized dependency management and CI/CD workflow improvements. - Enhanced clarity and maintainability of environment checks and logs, enabling faster incident response. - Strengthened Kubernetes CRD tooling and automation, reducing manual drift and improving deployment consistency. Technologies/skills demonstrated: - SPDK, Go, and systems-level robustness; concurrency controls (mutexes); enhanced logging and observability techniques; CI/CD automation and dependency version management; Kubernetes CRD tooling and automation; cross-repo coordination and release hygiene.

December 2024 delivered a focused set of reliability, data integrity, and observability enhancements across Longhorn core components, translating into tangible business value for production workloads. Key features include live engine upgrade support, snapshot integrity improvements, SPDK engine robustness, startup reliability improvements, and comprehensive monitoring enhancements. Additional IO tuning and configuration externalization further reduce operational risk and manual intervention, while a strengthened test and observability baseline supports faster iteration and safer releases.

Month: 2024-10 — Focused on stabilizing the longhorn-instance-manager stack through targeted dependency modernization. Delivered a high-impact change: nvme-cli updated to version 2.10.2 in the Dockerfile to improve stability and compatibility across environments. This aligns with the maintenance plan for NVMe tooling and reduces deployment risk for users relying on the instance manager. No major bugs fixed this month; the effort prioritized tooling resilience and release hygiene. The change is traced to repository longhorn/longhorn-instance-manager with commit ceaabbacce2425f7860bc67117a21d4f572893a4.