@tqchen `docker_tag` is under metadata; therefore it's mostly seen as optional 
(and is here for example purposes)
Indeed `num_cpu_threads` is a tricky one and I thought long and hard about 
this; it makes sense not to place it under `software_config`, and instead could 
be considered a `hardware` metric. But generally thinking, when do we want to 
reduce the number of CPU threads that are made usable by the hardware target? 
For instance with `n1-standard-16` we have 16CPUs. In what situations do we 
want to reduce the number of available virtual threads? And how would that be 
enforced? There are multiple ways to do so; one example is while doing `docker 
run` we can pass the number of CPUs the container can utilize.

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