Metrics are not the first thing I think about when thinking of a Test Strategy. A Test Strategy helps me guide my testing. Drive the choice of testing I do. How do metrics play a part in that?
I have a love/hate relation with metrics. This is because I think it is generally a good idea to have metrics to measure useful and meaningful thing that drive value. That help me make decisions about the way we work or the product we are working on. On the other hand, we should be really careful with metrics. There are many really bad metrics.
What problem are you trying to solve or what insight do you want to gain? Which data could help you make decisions? Try to find metrics that support that. Have a look at the links I provided on “meaningful and bad metrics” to get an idea what could help you.