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Sep 16, 2019 at 22:17
Excellent deep dive into the chain of events that led to an outage at Cloudflare in July:
Details of the Cloudflare outage on July 2, 2019
Almost nine years ago, Cloudflare was a tiny company and I was a customer not an employee. Cloudflare had launched a month earlier and one day alerting told me that my little site, jgc.org, didn’t seem to have working DNS any more.

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One interesting property of both stdin/stdout based REPLs and RPC based REPLs is that they need to support asynchronous events. In both these programs, I don't need to wait until the function is done to see the output printed. It's not sufficient to read-eval-wait-print-loop.
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Mar 27, 2019 at 19:37
On the perils of storing data in UTC: https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a-silver-bullet/ (Users expect future events to happen at the time specified, even if the timezone changes its policy on summer time transitions!)