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The read loop added to a handler's drop count atomically while the statistics endpoint and the metrics log read it as a plain field, a data race whenever messages were dropped. The count is now an atomic.Uint64, read with Load. A test reads the handler statistics while the read loop drops messages for a handler that never finishes one. Run created the WHOIS fetcher and gave it to the HTTP server after the server had started, while request handlers could read it. The fetcher is now set before the server starts. Model: opus-5-5