Monthly summary for 2026-05 focusing on delivering business value through reliable routing, test stability, dependency correctness, and clear product documentation across rabbitmq-server and rabbitmq-website. Highlights include advanced Khepri v5 routing isolation, improved metadata store reliability, dependency resolution fixes, and clarified deployment/docs messaging to reduce operator confusion and improve customer trust.

Month: 2026-04 – Focused on performance, reliability, and security for rabbitmq-server. Delivered core routing/permissions optimizations, pre-auth security hardening, dead-lettering correctness improvements, DLX failover reliability fixes, and QA/docs enhancements. Result: higher throughput and resilience, safer pre-auth handling, and better developer visibility into changes and tests.

March 2026 monthly summary for developer work across rabbitmq-server and rabbitmq-website. Key features delivered (highlights by repository): - rabbitmq-server: Queue Metrics Filtering Enhancements — /metrics/detailed now supports Erlang-compatible regex filtering for queues, with input validation and compatibility with existing vhost filters to enable targeted monitoring and reduce payloads. (Commits: 0bba54e1ffead47091daa1565772a66a846856c8; d40d796faead184c2ac33ef5a10749a3f296f0e3; f6ad04ffab466ef023b58a0d2e998fb35b47ddb5) - rabbitmq-server: Code Cleanup and Consistency Improvements — standardize terminology to "binding key", remove unused Mnesia-related code and legacy feature-flag compatibility code, and simplify DLX handling by removing reliance on rabbit_fifo_index. (Commits: b06a379068a2cc70b024bcd2a4ec4112e15efb65; b9e89fa6d18458f9f879f62f08fa9a9a9d07182d; 6d6932b56043f6cae1866944273dd9c66a565975; 34df56a3da0a57661f592d78de850af708c4309b; 2a9ba1959b769d4da36012105dab587a2d03fe0b) - rabbitmq-server: AMQP SAC Consumer Status Notifications — extend AMQP 1.0 signaling to consumers about Single Active Consumer status, reducing unnecessary traffic by sending updates only on state changes. (Commit: 817a4d4351d36de373b198e8c93656a92f1d5383) - rabbitmq-server: Robustness and Observability Improvements — validate and prevent reuse of link handles, fix local shovels crashes with plugin queue types, add dedicated logging for consumer timeouts, and align delivery counts with tests. (Commits: 4b59c196417b2f6f858db5fcfcb82027268d23d1; 048dc9e6ea1e7b75d30095123d6539c26044dfc2; 1898ac1f3f13bdbfc0c0d9fd554556907d23412c) - rabbitmq-website: Documentation and quality improvements — VMware Tanzu documentation updates, intra-cluster compression plugin introduction, Prometheus metrics queue filter, and security patch for DOMPurify, plus SAC/x-modulus-hash documentation. (Commits: 63e8c1f9aeeff9a095e7c5c848e48667eb21d0ab; b32b59c7e26b8df282be9d3aa679b15f1b221977; 4b145e950f18c912e8506a8537c23b4301b568ab; 4165409e66dd4fc15e0b892862c8aa4d0bd333d4; d328e151c4bf6732f5bbdd105adc275fc39404f2; 850c15fdb7872a4da0776d63beb0bd37ab0f675f; f1fb03c576013666e8dca18992cd0586931283db; 037840ffc7d536a0f6d1b7c9f000ee30e1b5742d) Major bugs fixed (highlights): - Robustness: resolved local shovels crash caused by missing queue-type boot counter initialization; introduced queue_type_registrations boot phase to synchronize queue type registrations with shovel counters, enabling correct counter initialization across queue types. (Commit: 4b59c196417b2f6f858db5fcfcb82027268d23d1) - Delivery-count synchronization: fixed delivery-count/credit alignment between queue leader and session to follow AMQP spec, avoiding crashes and ensuring correct credit handling after leadership changes. (Commit: 1898ac1f3f13bdbfc0c0d9fd554556907d23412c) - Timeout logging: added debug-level timeout logging for consumer timeouts to improve observability. (Commit: 048dc9e6ea1e7b75d30095123d6539c26044dfc2) - Metrics filter edge case: ignore empty queue filter parameter to prevent invalid requests from affecting metrics gathering. (Commit: f6ad04ffab466ef023b58a0d2e998fb35b47ddb5) - Security: website DOMPurify upgrade to patched version to address vulnerabilities. (Commit: 4165409e66dd4fc15e0b892862c8aa4d0bd333d4) Overall impact and business value: - Reduced monitoring data volume and Prometheus scrape costs through precise queue filtering, while maintaining visibility across multiple metric families. - Improved reliability and stability of messaging paths with boot-order stabilization and enhanced error handling; lower operational risk through improved observability and targeted logs. - Strengthened security posture via DOMPurify patch and more secure documentation practices; better cross-team documentation for SAC and new exchange types. - Documentation and tooling improvements in the website repo support easier adoption of VMware Tanzu, Prometheus integration, and new intra-cluster features. Technologies and skills demonstrated: - Erlang/OTP boot workflows, boot_step orchestration, and queue-type registration coordination. - AMQP 1.0 protocol signals for SAC and dynamic link state properties. - Regular expression input validation and performance considerations for metrics filtering. - Cross-repo coordination, CI/test maintenance, and security hygiene (DOMPurify patch).

February 2026 monthly performance highlights across rabbitmq/rabbitmq-website and rabbitmq/rabbitmq-server. The work focused on improving documentation clarity, broadening AMQP 1.0 broker compatibility, refining delivery semantics, restoring tool usability, and enhancing observability and MQTT integration reliability. Key outcomes include updated Quorum Queues docs clarifying poison message handling and per-message TTL memory overhead; expanded AMQP 1.0 broker coverage (Azure IoT Hub and Apache Artemis) in the docs; refined message delivery semantics and added test coverage for header-based routing; Observer CLI compatibility fixes to align with new q_head/q_tail keys; and improved observability, debugging, and connection reliability for MQTT/RabbitMQ, including policy-change logging and Khepri-related connect fencing. These changes improve production readiness, reduce MTTR, and broaden ecosystem compatibility.

January 2026 (2026-01) monthly summary focusing on business value and technical achievements across rabbitmq-server and related tooling. Key features delivered include queue core reliability and API stabilization, CLI/genearalization across Ra-based queue types, and shutdown/supervision reliability improvements, complemented by performance-oriented test framework updates and MQTT security refinements. Cross-repo efforts also included user-facing doc adjustments to improve clarity for reply_to handling and AceMQ communications. Key features delivered: - Queue Core Reliability and API Stabilization: Improvements to queue message order validation, idempotent member management, API cleanup, unhandled queue actions handling, and AMQP client efficiency to strengthen reliability of queue operations. Commits include f9b63ac65884821064183e3c4cdb2904ae435d4d, 13b3ee8f5fe6dd5d0919e5955147f604b6f80ae6, 98cc3f07f432b20725d618f752f669b414335d, dcb52c2f08350bdd0197ee4f0dd5dde97fb92e5f, 9b747bf41e7a6a5b4dd845b41a76a8d9d3f81fbc. - Testing Framework Stability and Performance: Hardened test init/cleanup/execution paths, faster test suite execution, and removal of stale components to improve reliability of failures reproduction. Commits include c7c4de02f6fbdd29a35560e3ec12656b6109b7a4, 0cb65c5cd114da6f83fadfb65976dd124a0bcf30, bdf20290e502502cb632010a75eddf1894e34f49, 8def0a03b728c7082f400afca2469bde93f6fe50, 51bf9d65ec0c6e75095eaee790d7f6f8f1381923, e50a6bf4d25b39dfb349d63d358d7b5ad089ae4d. - CLI and Queue-Type Generic Support: Made rabbitmq-queues CLI commands generic across Ra-based queue types to enhance cross-compatibility and future extensibility. Commit: 917a6125a51fd628e77f131983a491d74e719318. - Shutdown and Supervision Reliability: Strengthened shutdown handling and corrected supervision types with infinite timeouts; ensured federation supervision hierarchies stop before app termination. Commits: e40387e454db652e85e9bbc3b1fe1c1b6d6d01e6, 512553e0919bec95d88b10146ba0b6119422c44f. - MQTT Access Control and Security Improvements: Refactor to handle unauthorized access with configurable disconnection behavior. Commit: 416bf867334f53407f7098df55db4315aa0674be. Major bugs fixed: - Ignored unhandled queue actions to enable safer future extension (dcb52c2f08350bdd0197ee4f0dd5dde97fb92e5f). - Made add_member and delete_member idempotent to prevent duplicate/missed state changes (98cc3f07f432b20725d618f752f669b414335d). - Cleaned up test framework dead code and timer issues to ensure accurate test failures and faster feedback (0cb65c5cd114da6f83fadfb65976dd124a0bcf30, bdf20290e502502cb632010a75eddf1894e34f49). - Fixed test coverage for vhost failure and speed optimizations in test helpers (8def0a03b728c7082f400afca2469bde93f6fe50, 51bf9d65ec0c6e75095eaee790d7f6f8f1381923). - Documentation and UI consistency improvements to reduce user confusion (f65295b010b584f5fb8be6edca4d2e162e9446de; 462e88c68a4efa372fc5ba56cea954908e3ab178). Overall impact and accomplishments: - Significantly strengthened core queue reliability and API stability, enabling more robust and scalable queue operations for production workloads. - Enhanced cross-queue-type operability via generic CLI integrations, improving operator experience and reducing maintenance burden for multiple Ra-based queue types. - Reduced operational risk through improved shutdown semantics and federation supervision handling, supporting safer upgrades and downtime procedures. - Accelerated iteration with a faster, more stable test suite and healthier test feedback loops, enabling quicker delivery cycles. - Improved security posture and policy resilience with MQTT access control refinements, reducing exposure to unauthorized access. Technologies/skills demonstrated: - Erlang/OTP supervision trees and proper child spec usage with infinity timeouts. - Ra-based queue type architecture and refactoring towards generic APIs (rabbit_queue_type_ra). - AMQP 1.0 client efficiency optimizations (disposition handling via cast). - Test framework optimization, test scaffolding and faster integration tests. - CLI tooling generalization across queue types and UI/documentation accuracy improvements.

December 2025 monthly summary for developer work across RabbitMQ Server and Documentation. Focused on delivering reliability, observability, and maintainability improvements for AMQP/MQTT messaging paths, with notable impact on debugging, queue reliability, and CI stability. Key features delivered and major improvements: - Delivery count tracking and reliability in the AMQP client: Implemented and tested delivery count increment logic based on message settlement; added tests for both classic and quorum queues to strengthen reliability and flow guarantees. Representative commits include: 9e4a27538d2d6a2c52c60e6b4f0e0573cad7d299; f418595d476d5a59485625acf62582b0a891e6f5; 960cd60c643159def008bb03d2796fea04177479. - Publishers receive queue name and rejection reason for rejected messages (AMQP 1.0 and MQTT 5.0): Enhanced feedback to publishers to improve debugging and flow tracing across protocols by including queue name and rejection reason in Rejected outcomes. Representative commits include: c4fdca4fa9d09a90b95c2d400a6ade3d8f28d76d; 81af72db2eb4f017fcd7607fd2736d5e03433f8e; f5c3b4f2120d705aec75127c5302cae00f5c8c80. - Enhanced error handling and descriptive errors for AMQP sessions: Added descriptive error messages for missing bodies, improved error descriptions in AMQP error handling, and updated error conditions to reflect max queue length scenarios (resource-limit-exceeded). Representative commits include: 8d7d2918d48dd27a02011f67e73518a72a98f376; 34aea114b41af785ce894dd314596a899a0f6c94; f75f8ffdb1a1a9d58f90f4b3a870dc7c5fd3db9d; 2670200f1a14071e4dbc678926aebb5a2d834200; 92b6b6c67ae019449b010a3c849e4f2f07207cc5; fef244956e979083d40f7c002e11623244cfd5f8; 4f427f53b21a32a74e1fd7f951d869a6eef804a1. - Quorum queue performance and maintainability improvements: Refactored quorum queue module to reduce external calls and clarified type specs to improve performance and maintainability. Representative commits include: 74af39d6977dbfbe1938650774526b0040bddd25; 8688fbaa9f72fd998f5827b8e41a8015eeb5a9b9. - Test suite robustness and stability improvements: Adjusted test configurations and scenarios to prevent timeouts and flakiness in volatile queues, reducing CI noise. Representative commits include: 204ff726c52603e128c836575c113f1705e2dca8; de45be3255a6e901bcdfe8ffcca409f7a8e83f24. Other notable effort: - Documentation enhancements for the rabbitmq-website to clarify error handling and JMS client role, ensuring operators and developers understand error fields and JMS integration. Representative commits: c4489dc113304b3740a209b29b8a975b1bba8b8; aa5b0f8179b4095cf7ea17cc15212708633a5ed8. Overall impact and business value: - Improved reliability and observability across messaging paths, enabling faster debugging and fewer production issues. - Better end-user and operator experience through clearer error messages and richer feedback to publishers. - Reduced CI noise and increased confidence in deployment, with more stable test suites and maintainable quorum queue code. - Demonstrated proficiency with Erlang/RabbitMQ architecture, AMQP 1.0 and MQTT 5.0 protocol nuances, and robust test automation.

November 2025 highlights for rabbitmq-server: Implemented reliable quorum queue dead-lettering under drop-head by correcting DLQ order and validating with tests; Introduced an at-most-once DLQ mechanism to dramatically cut overhead when many messages are dropped or policy updates occur; Refactored the evaluate_limit logic and related state-management flow to simplify maintenance and improve throughput; Published release notes for RabbitMQ 4.3.0 and 4.2.1 to communicate fixes and enhancements; Expanded and modernized the quorum-queue test suite to cover dead-letter reasons (rejected, delivery_limit, expired, maxlen) and ordering, removing outdated tests. Business value: improved DLQ reliability, scalability, and operator visibility; increased maintainability and faster onboarding for future changes; supports smoother upgrades to 4.3.x with clearer documentation.

October 2025: Delivered high-impact features and reliability improvements across rabbitmq-website and rabbitmq-server with a strong focus on debugging support, upgrade readiness, and code quality. Major deliverables include a blog update recommending the RabbitMQ AMQP 1.0 JavaScript library; enhanced HTTP auth debugging via optional denial reasons; readiness hardening for 4.3 with feature flags and removal of legacy paths; targeted code cleanup; and comprehensive release notes for 4.3.0 and memory bug fixes in 4.1.6/4.2.0. These changes reduce debugging time, streamline upgrade paths, and reduce technical debt.

September 2025 performance summary across rabbitmq-server and rabbitmq-website. The month focused on delivering stability, performance, observability, and clearer release communications to support business goals around reliability, throughput, and developer onboarding. Key efforts spanned dependency management, targeted performance work, test suite modernization, queue semantics governance, security logging enhancements, and expanded documentation for customers and developers.

August 2025 performance summary: Strengthened reliability and cross-version interoperability across RabbitMQ components. Key outcomes include fixing AMQP protocol state initialization to align with AMQP 0-9-1, expanding Direct Reply-To test coverage to validate publisher confirmations and reply-to handling, enabling mixed-version testing by default for amqp_filter_set_bug, and improving AMQP 1.0 error handling by detaching links on link-level errors. Additionally, documentation and branding updates (Stream Filtering docs link, reply_to conversion rules, release notes cleanup, and website logo refresh) reduce onboarding friction and improve external-facing accuracy. The combined work enhances stability, throughput, test confidence, and cross-version compatibility, delivering measurable business value for operators and developers.

July 2025 monthly results delivering foundational AMQP SQL filtering capabilities, API naming clarity, and performance/robustness improvements across rabbitmq-server and companion website updates. The work this month positions RabbitMQ to offer richer, standards-aligned filter semantics, safer defaults, and accelerated parsing, with clear documentation and enterprise-ready context.

June 2025 highlights: Delivered critical performance optimizations to rabbitmq-server, enhanced management UI with AMQP filters, standardized event naming, and stabilized CI; plus documentation and release-page improvements on rabbitmq-website. Overall, these efforts improved runtime efficiency, reliability, and user/operator experience while strengthening the release and documentation workflow.

May 2025 monthly summary focused on delivering clear user guidance, configuration correctness, and stability across rabbitmq-server. Key outcomes include updated release notes for AMQP 1.0 durable field breaking change with compatibility guidance across client libraries; removal of an unsupported 'single-active-consumer' policy to prevent misconfigurations for quorum and stream queues; and targeted internal stability improvements driven by code cleanup, refactoring to a more idiomatic approach (including the use of maybe), and cross-node Ra command consistency tests along with obsolete test utilities cleanup. These deliverables reduce support overhead, improve cluster reliability, and strengthen maintainability for future iterations.

April 2025 monthly summary focusing on delivering stability, extensibility, and clearer documentation across RabbitMQ server and website. Emphasis on business value: reliability under high concurrency, easier integration via interceptors, compliance with AMQP specs, and broader accessibility through WebSocket support and up-to-date docs.

March 2025 focused on stability, diagnostics, and CI reliability for rabbitmq-server, with key reliability fixes for AMQP 1.0 client handling, enhanced misconfiguration visibility, and improved CI/test hygiene to support robust operations and faster issue resolution.

February 2025 monthly summary: Delivered key AMQP 1.0 enhancements and reliability improvements across rabbitmq-server and rabbitmq-website, delivering business value through stronger performance, stability, and maintainability. Highlights include enforcing a safe AMQP filter expression limit, updating dependencies, restructuring tests for reliability, enabling graceful shutdown, and expanding documentation to reflect new capabilities and best practices.

January 2025 delivered a targeted set of user-facing features, documentation corrections, and stability improvements across rabbitmq-website and rabbitmq-server. The work reduced user confusion, expanded protocol and social features, and strengthened CI reliability for faster validation cycles. Key outcomes include clarified AMQP behavior guidance, added Bluesky author links, and expanded AMQP/WebSocket and UI capabilities, along with improved debugging visibility and governance of plugin docs.

December 2024 performance summary for rabbitmq-server and rabbitmq-website. The month delivered reliability improvements, expanded client connectivity, and operational efficiency gains, with clear business value through durable AMQP entities, WebSocket transport, and targeted infrastructure optimizations. Key outcomes include a bug fix for AMQP filter expression prefix handling, enforcement of durable AMQP entities, and AMQP over WebSocket support, complemented by CI/test efficiency enhancements and documentation updates that improve developer productivity and customer clarity.

Month: 2024-11 Overview: Delivered user-facing clarity for AMQP 1.0 vs AMQP 0.9.1 behavior in the website UI and RPC guidance, improved internal documentation for Event Exchange Plugin, and documented MQTT re-authentication and QoS 2 handling. Strengthened test stability and centralized type inference logic to reduce duplication and risk. These changes improve customer onboarding, reduce support friction, and lower maintenance risk across website and server components. Key initiatives and outcomes: - Features delivered across rabbitmq/rabbitmq-website: • AMQP 1.0 visibility in Management UI and RPC guidance: clarify management UI behavior (show message rates for AMQP 0.9.1 only), provide RPC guidance for AMQP 1.0 clients, and note Direct Reply-to remains exclusive to AMQP 0.9.1. Commits: 96c8ffa5ad83e07a423e8953081695cf294f6ac8; 1216c94e0e6c509e04b8c33835c183775aad18c5. • Event Exchange Plugin documentation improvements: consolidate event type docs and clarify consumption of internal events. Commit: ff0dc93f1044b8530a0524333c914186f8457252. • MQTT re-authentication and QoS 2 handling documentation: document limitations on MQTT 5.0 AUTH packets and explain QoS 2 handling when tokens expire. Commit: 0da41f3b986a2a19f29b4ede25707d06a5ff1eca. - Features/Bugs addressed in rabbitmq/rabbitmq-server: • Bug: MQTT management plugin connection test reliability fix by replacing direct assertions with an eventually macro to wait for the expected state, increasing test stability. Commit: 090384fe376d9316eba503987c492d20b74bf51f. • Bug: AMQP 1.0 Erlang client type inference centralization to amqp10_client_types:infer/1 to reduce duplication and prevent potential integer overflows, improving maintainability and reliability. Commit: 6e8b566323a6777fdcfdbc6fa486c35394ff99d5. Key achievements (top 5): - AMQP 1.0 visibility and RPC guidance delivered for AMQP 1.0 clients, with UI adjustments for 0.9.1 metrics and direct-reply-to note. - Consolidated Event Exchange Plugin docs and clarified internal event consumption. - MQTT re-auth and QoS 2 behavior documented for clarity on token expiry scenarios. - Stabilized MQTT management plugin tests to reduce flakiness and improve CI reliability. - Centralized AMQP 1.0 Erlang client type inference to reduce duplication and overflow risk. Overall impact and business value: - Clear, accurate guidance reduces integration guesswork for clients and accelerates onboarding and integration work. - More reliable tests decrease CI churn and enable faster release cycles. - Maintainable code and documentation reduce long-term maintenance costs and support burden. Technologies and skills demonstrated: - Documentation best practices and user-focused writing across website and server docs. - Test stability engineering and CI reliability improvements. - Refactoring and centralization to reduce duplication and overflow risk in Erlang code. - Cross-repo collaboration, aligning website and server work for coherent user experience.

Month 2024-10: Focused delivery of robust AMQP 1.0 capabilities across rabbitmq-server and targeted documentation improvements on rabbitmq-website. Key work stabilized connections, improved observability, and clarified token renewal practices, driving better reliability and developer experience.

Month: 2024-09 — Focused on strengthening observability for RabbitMQ Server by delivering AMQP 1.0 Connection Metrics in the Management UI. This work exposes metrics such as network bytes, session counts, and garbage collection data for AMQP 1.0 connections, enabling operators to monitor usage, detect anomalies, and optimize resource allocation. The change is tracked in rabbitmq/rabbitmq-server and documented via commit 3db4a97cfb10a028cd469ce4de40ce316c3b5a3a with message 'Expose AMQP connection metrics'.