Exploring Regression Layers and Blind Spots in Postmortem Reviews

On 2026-11-07 at 09:02, the AI section of DEV Community published a piece titled Exploring the "recurrence layer" and error-prevention blind spots in postmortems. The article argues that engineering teams have a habit of wrapping up a postmortem by adding a review step, typically phrased as "we have added a review step so this cannot happen again." The author contends that this kind of static review merely blocks the path along which the failure was noticed, rather than genuinely preventing the same class of failure from recurring in other services or other parts of the stack. The piece illustrates this with a concrete sequence: fourteen months later, the problem happens again. By then the service is different, the engineer is different, and the quarter is different, yet the review step that was introduced earlier is still in place. It had been there the whole time, the author notes, but it never stood between the failure and production; it stood between the failure and being noticed. The author names that gap the recurrence layer, and frames restitution as paying only for the last error. The supplied excerpt breaks off at that point, so the article's concluding recommendations are not included in the available material.