Incident Report for Nov 18, 2025

On November 18, 2025, Langfuse Cloud experienced a significant multi-hour outage from 11:33 am to 2:40 pm UTC due to a global incident with Cloudflare, which affected all API and UI traffic routed through its proxy. This incident exposed Langfuse's overreliance on Cloudflare as a single point of failure, causing major service disruptions and resulting in the loss of observability data and unavailability of key services like the Langfuse Prompt Management API. Despite early alerts and partial service recovery, immediate mitigation was hindered by the inaccessibility of the Cloudflare dashboard, which prevented configuration changes. As a temporary measure, DNS-based bypasses were published to allow direct access to AWS Application Load Balancers, but a full resolution was only achieved by 2:40 pm. Moving forward, Langfuse plans to diversify its infrastructure to avoid such dependencies and ensure greater resilience, including assessing alternatives for WAF and proxy functions and considering migration of DNS management and status page hosting away from Cloudflare's infrastructure. The incident highlighted the critical need for infrastructure diversification to prevent future outages, and Langfuse has committed to implementing changes to avoid similar disruptions.

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