Units on metrics?

[StefanSchubert]

Hi there!

First thanks a lot for the exporter. I have a question. Is there somewhere a piece of documentation which maps the /metrics to the provided units?

E.g. does java_lang_MemoryPool_Usage_used deliver bytes or kilobytes?

Or can you update the Readme.md to point to a sample grafana dashboard, where everything is set right to start over with it?

THX in advance
Stefan