Metrics are a facility designed for Storm, and has no knowledge of Trident, which is an abstraction on top of Storm. So messages will appear that are used by Trident under the hood. To have statistics for Trident, you are a bit on your own. But it is easy to use a general metrics library like https://dropwizard.github.io/metrics to obtain information from a worker via JMX for example.
Cyrille
