Do you use service log or metric data for non-dev related purposes?

An anecdote - I worked on a project in a past life where we needed to turn off the publishing of various "deprecated" internal metrics. We found out by happenstance a week before going live that a sister team was consuming our internal metrics to generate critical real time financial information. Do you have similar stories of log/metric data being used in business critical functions? If so, how did you manage this?