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Determining the start of the next business day in Oh Dear

Original – by Freek Van der Herten – 9 minute read

When a site is down, Oh Dear sends a notification every hour. Since last year, our notifications can be snoozed for a fixed amount of time (5 minutes, 1 hour, 4 hours, one day).

In the evenings and weekends, our users might not want to receive repeated notifications. That's why we've added a nice human touch: all notifications can now be snoozed until the start of the next workday.

In this blog post, I'd like to share some of the code that powers this feature. We'll focus on how the start of the next workday is calculated.

Read more

Cold Starts in AWS Lambda

Link –

Mikhail Shilkov explains what cold starts are and discusses some interesting benchmarks.

This article describes AWS Lambda—the dynamically scaled and billed-per-execution compute service. Instances of Lambdas are added and removed dynamically. When a new instance handles its first request, the response time increases, which is called a cold start.


Using composer patches

Link –

When you use software that is open source, you'll sometimes run into issues or small bugs that have already been fixed by the community in a PR or an issue, but have yet to be merged and/or released. If you're impatient and need that fix now, composer patches can be a solution for this problem.


What's new in PHP 8.1

Link – - submitted by Brent

PHP 8.1 is currently in active development and will probably be released somewhere around the end of November 2021. We already know some features, changes and deprecations, so let's go through them one by one.