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Hey, I'm the one who wrote the blog post. This was originally a talk a colleague on my team gave internally about 2 months ago and then I wrote it up as a blog post a few weeks back, before we had that big incident so there wasn't any particular thought on not mentioning it.

As the postmortem mentioned, it wasn't related to any of this load balancing work or our providers, it was us running into trouble with a different part of our system. That was a busy week (both in terms of numbers as you can see on https://www.gov.uk/performance/govuk-notify/notifications-by... but also in terms of us fighting fires).

Hey, I'm the person who wrote the blog. I was slightly interested in the pattern too but didn't take the time to look into it. I assumed it was either something to do with a service sending us traffic in that pattern or maybe just something to do with Grafana. It could also be some unexplained behaviour in our system, maybe something to do with how we are pulling items off the queue. If I find some time next week I might take a proper look though!

Just in case it wasn't clear from discussion elsewhere on this post, Notify didn't send out the text message mentioned in the news. That message was sent directly by the networks at request of the government.