Earlier quoted context omitted.
We have all sorts of slack channels set up to coordinate activity, so that internal customers can talk to engineers easily, or engineers can engage with each other. If slack goes down, we'd have to work all that out. For many days, it would be a huge drag on the process, slowing down interactions. Other IM platforms wouldn't solve that just by existing. Sure, in principle one could set up such channels elsewhere, but…
Sounds like having a fallback pre-defined would be prudent if it's that important and you don't feel you could collectively extemporise something. "If Slack goes down, the plan is to use WhatsApp/Teams/Jeff's Matrix homeserver in his garage until service comes back. A list of group channels will be emailed if that happens." Then if it does go down, you don't have to waste the first day arguing about the plan.
Re: Inside the longest Atlassian outage
#771People would forget, but having a well-documented plan at a well-understood URL would not be a bad idea.