[Doc]Rework monitoring docs#11614

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karenzone wants to merge 3 commits intoelastic:masterfrom

karenzone:monitoring-take2

Commits on Mar 3, 2020

Rework monitoring docs
karenzone
committed

Commits on Mar 12, 2020

More cleanup and corrections for new content
karenzone
committed

Commits on Mar 19, 2020

Update settings for new internal collection
karenzone
committed