Have 'Metadata' place in trace server provider

It would be interesting to get trace specific one shot data,

e.g. :
* Host Name
* CPU architecture (number of cores/bigLITTLE?)
* System Memory
* GPUs available (number of compute cores?)
* Network config
* Storage config
* Program being traced, if known
* Anything immutable on a given trace (on older systems, frequency)

This information can help with Axes ranges as well as giving more context to the user.