[STEP-217] Add timestamped versions of resource usage messages #917
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Background
New versions of the Linux resource usage messages, with the addition of timestamps.
See section in design doc.
Also fixes a typo in a previously existing message.
The changes are split into two commits for easier review, the first one is for updating the YAML spec and the second commit holds all the changes as automatically generated by the
makestep. Will squash them on merge.