If you're dealing with a system outage affecting hundreds or thousands of users, it's probably impossible to say anything else but generics ("inconvenience", "i

If you're dealing with a system outage affecting hundreds or thousands of users, it's probably impossible to say anything else but generics ("inconvenience", "issues", etc.). Just say what went wrong, how you're dealing with it now and in the future, and what you're doing to make it up to everyone that was (potentially) affected. If someone writes back with a specific incident caused by the outage, you can address it directly then.