We have a variety of helpers and subsystems to interact with the OS process space. These pieces mostly live in src/mongo/stdx, src/mongo/platform, and src/mongo/util.

Notable topics include:

• Process Info Fetchers (processinfo.h)
• Signal Handlers (signal_handlers*.h)
• Stack Traces and Analysis (stacktrace.h, StackLocator, etc.)
• Termination Handlers (set_terminate*.h)

Given the separate directories of these related topics, we should document it as a new markdown file in docs/.

This is intended to be abstract documentation, describe relationships and state transitions not code in common language.