[hocuspocus]

Even monoliths are dealing with outbound network calls.

I assume it depends on your current solution, but for a new project, I find that setting up instrumentation and pushing traces to Zipkin or Jaeger is very straightforward, at least on the JVM. Out of the box I can see the overhead on top of DB queries and plain HTTP calls. And if some bit of internal logic is particularly time consuming, I can add a custom span in two lines of code and figure out what's going on. There are of course other ways to achieve the same thing, but the experience feels nicer.