Clojurians Log v2

Has anyone here collected custom user timing metrics from a re-frame application (e.g., via https://github.com/akamai/boomerang or google analytics or the like)? If so, what approach did/would you take? Just rely on the out-of-the-box instrumentation? Create a custom effect/interceptor? Using https://github.com/day8/re-frame-debux is fine in dev to get function execution timings but how might you think about recording the user's experienced timing that might be across events?