Breadcrumbs is a lightweight distributed tracing library for Haskell with the Effectful effects system.

In simpler terms, it's a logging framework for execution of a program that aims to use the power of fancy microservice tools such as Zipkin to produce fancy hierarchal flows. Consider it a stack trace/flame graph, except the unit of work is not function call but some higher structure in your program.

Currently only used in Yaifl for tracing text adventure logic.