99.99 is four nines, not two. https://uptime.is/four-nines
Assuming the failures are deterministic across workspaces (is that true?) Slack has been down for over an hour for some workspaces, since the problem started at 10:54 AM EDT.
What is the A part of Stack's SLA?
> 1. We purposely made our commitment to the ‘fourth 9’, viz. 99.99% uptime guarantee in contrast to the typical SLAs which tend to offer 99.90%. We believe that extra availability makes a difference: the ‘fourth 9’ is important when your team relies on Slack every day. You need Slack at least 9,999 out of every 10,000 minutes. [1]
[1]: https://get.slack.help/hc/en-us/articles/204113126-Service-L...