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Your zero-downtime deploy is probably fine. Check your p99 before you believe it.

I went looking for dropped requests during a rolling restart and found something more annoying than dropped requests: a deploy that looks perfect and isn't. Setup is deliberately boring.

  • Zero-downtime deploy may appear successful but can fail during process.
  • Lack of signal handling in Node/Express app causes mid-flight requests to die.
  • Monitoring p99 latency, not just error rates, crucial to detect deploy issues.

Matt Haughey: ‘The Car Industry a/B Tested Selling a Car With and Without CarPlay and the Results Are Not Shocking’

Matt Haughey: One case in point is the Honda Prologue EV. It’s a partnership between Honda and Chevrolet, where the Prologue is basically a Chevy Blazer EV with Honda badges, slight visual differences…

  • Honda Prologue outsells Chevrolet Blazer by 43%, 73%, and 166% in three periods
  • Prologue includes Apple CarPlay and Android Auto integration, unlike Blazer
  • In 2026, consumers purchase Prologue 1.5 times more often than Blazer

The three-state dark mode toggle is the correct answer

An application should not take away the decision a user has previously selected. That is the main point of the argument. All other details are insignificant.

  • Three-state dark mode toggle proposed as solution
  • Addresses time-of-day bug in two-state toggles
  • Adopted by GitHub, StackOverflow, CodePen

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