doc/man/common-intro.txt

   1 The https://lttng.org/[_Linux Trace Toolkit: next generation_] is an
   2 open-source software package used for correlated tracing of the Linux
   3 kernel, user applications, and user libraries.
   4
   5 LTTng consists of Linux kernel modules (for Linux kernel tracing) and
   6 dynamically loaded libraries (for user application and library tracing).