In metrics, more is always better: Collecting new data tends to be high-ROI.
Beware: Software should be designed for observability from the ground up.
https://sites.google.com/site/steveyegge2/its-not-software In Servware, though, we have metrics for everything. And because all our code gardens are effectively immortal, virtually every metric you can think of, no matter how complex, can be sampled and plotted over time. So all our metrics look like line graphs, and anything that doesn't have "real-time" metrics is something that we're operating blind, which is no fun.