Since when was availability no longer part of security?

The Emma budgeting app is experiencing a technical outage, which the company claims is not a security issue. This incident has raised questions about the relationship between availability and security. The outage is being discussed on online forums, including a comments section on Hacker News. The company's statement distinguishes between technical outages and security issues, implying they are separate concerns. The incident is also being covered by the BBC, which is providing live updates on the situation.