April 2026 Summaries

On April 29, 2026, a configuration issue with the CDN account serving the FireHydrant Web UI caused a temporary service disruption, preventing static assets from being loaded and resulting in login failures. While the API and integrations for Slack and Microsoft Teams remained functional, the web interface was inaccessible to customers globally for 33 minutes. The incident was swiftly identified by synthetic monitors, allowing the on-call team to initiate immediate mitigation efforts. Despite the inability to update the public status page during the incident due to multiple communication path failures, service was restored by bypassing the affected CDN and subsequently fixing the configuration issue. The company has outlined corrective measures to prevent future occurrences, including enhancing CDN failover speed, ensuring redundancy for non-US regions, repairing Slack integration, and improving change management processes. The commitment to reliability and transparency remains a priority, with improvements aimed at maintaining service quality and effective communication during incidents.

FireHydrant's migration from Sidekiq to Temporal for its Runbooks automation highlights the challenges and solutions involved in scaling incident management systems. Initially built on Sidekiq, FireHydrant found Temporal's stateful orchestration and error handling more suited to their evolving needs, especially as Runbooks began incorporating multi-step logic, conditional branching, and third-party API integrations. The migration, executed using the Wrap, Refactor, Reroute, Retire (WRRR) method, was designed to minimize risks of correctness and incompleteness, achieving a 99.995% success rate in the first 24 hours. Temporal's architecture allowed for reliable incident management by providing a seamless workflow history and linear control flow, which simplified state management and reduced technical debt. The innovative use of a Compatibility Context ensured consistency across systems during the transition, preventing code duplication and technical debt, thereby enhancing reliability and maintaining high system availability. The process demonstrated that incremental, well-architected migrations could effectively bridge the gap between legacy and modern systems, ensuring resilience and maintaining focus on customer value.