Automatic merge from submit-queue (batch tested with PRs 43378, 43216, 43384, 43083, 43428)

Darwin won't build: syscall.Sysinfo issue.

**What this PR does / why we need it**: On darwin had problems building and testing because of syscall.Sysinfo_t etc which is a linux specific command. 

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:

**Special notes for your reviewer**: Definitely would like another set of eyes on the bootTime function, it will have to be inaccurate but open to suggestions about improving this for darwin.


**Release note**:
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NONE
```