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Cloudflare 這次閏秒炸掉:「How and why the leap second affected Cloudflare DNS」,影響範圍包括了 DNS query 與 HTTP request:

At peak approximately 0.2% of DNS queries to Cloudflare were affected and less than 1% of all HTTP requests to Cloudflare encountered an error.

主要的原因在於 Gotime.Now() 不保證遞增:

RRDNS is written in Go and uses Go’s time.Now() function to get the time. Unfortunately, this function does not guarantee monotonicity. Go currently doesn’t offer a monotonic time source (see issue 12914 for discussion).

修正的方式是針對時間回朔時處理:

In this patch we allowed RRDNS to forget about current upstream performance, and let it normalize again if time skipped backwards.

應該是因為 Cloudflare 這段程式還沒遇過 leap second 造成的...

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