know if the Openwhisk action is executed on a prewarm container by receiving the log from API

I install _openwhisk_ via _kubernetes_ cluster. I invoke my actions through the API and also receive their logs via API. But in the log, it is only known whether the action is _cold_ or _warm_, through initTime annotation. And it is not clear whether the cold action is executed on a _cold container_ or _preWarmed container_.
I tried to access this information through the _user-events service_ and _metrics endpoint_ via kubectl port forwarding and localhost:9095/metrics. But at this endpoint, only the cold start number is specified.
How do I know if the action is executed on a prewarm container?