observability

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Datadog Reveals How It Built A/B Testing: Hint, Your Percentiles are Lying (Without CUPED)

Sep 27, 2026 7 min read

Datadog details the engineering decisions behind their A/B testing platform, Datadog Experiments, emphasizing techniques like CUPED on percentiles for faster insights, ensuring verifiable warehouse results, and leveraging near real-time RUM metrics to accelerate decision-making for product teams....

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observability

Vercel stops charging for I/O wait time in new Sandbox CPU metrics

Jul 13, 2026 6 min read

Vercel has rolled out granular observability for its Sandboxes, giving developers direct visibility into active CPU and provisioned memory. The update introduces a fairer billing model where I/O wait times, such as external API or model calls, are no longer charged....

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