OpenTelemetry 
Why Now: The Eight-Year Wait for Unified Observability
An idea someone had fully worked out back in 2018, yet it took eight years before it could actually be built. This piece is about one thing: why now.
The Three Pillars of Observability: The Unification That Never Quite Arrived (Part 2 of 2)
Part 1 was about how the three pillars split apart. This part is about how many smart people, starting in 2018, tried to put them back together — what they actually built, and why none of it quite reached the finish line.