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WORKER BACKPRESSURE (PART 1): TEACHING QUEUE WORKERS TO SLOW DOWN

Canva built Worker Backpressure into its queue library so each worker adjusts concurrency from local success and failure signals, without a coordinator or extra network calls. During a 32.5-hour overload, the mechanism kept throughput near two million messages per hour while only 22 of 1.8 million failed attempts reached the dead letter queue. The design trades some throughput for stability and currently relies on a single health signal.

DEBUGGING OUR AI SEARCH ASSISTANT WITH AGENT TRACING

Sentry uses agent traces to debug failures in a search assistant that converts natural language into Sentry query syntax. A trace exposed a prompt bug that listed custom numeric fields as bare names instead of the required tags[name, number] form, which caused valid searches to return no results. Instrumenting local evals with the same tracing now lets the team inspect prompts, tool calls, and backend requests before changes reach production.

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