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The other bit is separating the service into isolated cells so issues in one don't affect dependent services everywhere like they had experienced before.

But yeah any good SRE could point this out years ago.

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Just odd a company worth billions and billions of dollars is just now discovering HA models standard since the 90s. Can expand the Clos network architecture to these distributed service applications too. But judging by Slack's client quality, mature concepts such as those must be new to them.

The linked AWS article specifically explains that it’s not just the typical single load balancer for cross AZ routing. I frankly don’t know where you’re getting that this means that HA is new to them.

Of course this isn't a typical single load balancer for cross AZ - but the general gist of their "new" architecture is first principles level of design. But sure, we can celebrate their minor achievement I guess

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