System Observability: Metrics, Sampling, and Tracing

> Metrics are simple, extremely cheap

You clearly haven’t seen our Datadog invoice :)

Jokes aside, I liked the idea of listing things by level of detail.

One related issue I run into all the time is how context gets lost when moving between layers. You start with host metrics, then Kubernetes wraps the host and overrides the tags, and suddenly you can’t filter host metrics by node anymore. Watch out.