[ares2012]

I agree, but I think there is a difference between metrics and having data to investigate. A metric is a value you are tracking over time, but when something changes you will likely need to do an investigation. That investigation might be the raw data, it might be some dynamic queries or it might be other metrics.

Tracking metrics because you think they might be useful in the future for diagnosing other problems doesn't make sense with modern systems as dynamic queries are so fast.