I'm quite taken by Proper NTP configuration for a few servers , though I must admit to a (small) hand in the refinement process. The OP has put together an answer that reads well and synthesises a lot of best-practice guidance. So my question is twofold:
Is at what point should I stop NTP sync'ing all my servers to community time sources, establish an internal timeserver pool, and sync the rest of my servers to those a suitable question for canonisation? And if so
Does this particular example of that question contain enough goodness to make the question a candidate for canonisation?