Borrowing from the Red Hat Developer Blog entry, here’s an introduction the “fedora-tools” image for Fedora Atomic Host.
When Red Hat’s performance team first started experimenting with Atomic, it became clear that our needs for low-level debug capabilities were at odds with the stated goal of Atomic to maintain a very small footprint. If you consider your current production environment, most standard builds do not include full debug capabilities, so this is nothing new. What is new, is that on Red Hat Enterprise Linux (RHEL) you could easily install any debug/tracing/analysis utility, but on Atomic: