https://segunsogunle.com/writing Distributed systems, observability and reliability. Essays and field notes on failures that pass every health check. en Wed, 26 Aug 2026 00:00:00 GMT https://segunsogunle.com/writing/the-question-that-became-clutta https://segunsogunle.com/writing/the-question-that-became-clutta Wed, 26 Aug 2026 00:00:00 GMT essay A slide from 2019, a catalog that lied politely, and one engineering question that kept surviving every change of system. https://segunsogunle.com/writing/marked-resolved-still-failing https://segunsogunle.com/writing/marked-resolved-still-failing Wed, 26 Aug 2026 00:00:00 GMT essay A closed incident proves that a workflow ended. It does not prove that the customer recovered, the system stayed correct, or the same failure will not return under a new number. https://segunsogunle.com/writing/why-maintenance-windows-exist https://segunsogunle.com/writing/why-maintenance-windows-exist Thu, 30 Jul 2026 00:00:00 GMT essay A maintenance window is a confession: somewhere, an operation was never made bounded, observable, or abortable. What rebalancing 50,000 Kafka replicas taught me about removing the confession. https://segunsogunle.com/writing/when-the-internet-goes-off https://segunsogunle.com/writing/when-the-internet-goes-off Thu, 30 Jul 2026 00:00:00 GMT essay Availability, designed from a place where the power grid is part of your threat model. Reliability lessons the textbooks cannot teach.