Metrics is good. Metrics is local. When local metrics is combined with another’s local metrics, it becomes a tale of two metrics. When metrics is combined system-wide, it becomes statistics.
Statistics is good. The problem lies with its interpretation. Why? Because statistics is just a snapshot of reality (or a sliver if you want) with some implicit or explicit assumptions depending on who made the statistics. It’s the same with disk failures.
Metrics or statistics, it’s the same thing. If something is deemed to go wrong, it will go wrong. So deal with it and have a Plan B or Plan C or craft a sound strategy.
Behavior of chaotic systems may be measured collectively but not its individual components.