F.A.Q.

Q: How do I μ/log to send the :mulog/duration in milliseconds?

μ/log will send the :mulog/duration in nanoseconds because it uses the monotonic timer with a nanoseconds precision which guarantee the highest precision even on very small measurement.

However, if you want to send the duration in milliseconds instead, you can provide a custom transformation function to the publisher which will be applied to all the events, prior the publishing.

For example, the following snippet starts the console publisher with a transformation which convert the duration into milliseconds.

(μ/start-publisher!
 {:type :console
  :transform (fn [events]
               (map (fn [{:keys [mulog/duration] :as e}]
                      (if duration
                        (update e :mulog/duration quot 1000000)
                        e)) events))})