-application or a custom Linux kernel, all that is left is actually
-tracing it. As a user, you control LTTng tracing using a single command
-line interface: the `lttng` tool. This tool uses `liblttng-ctl` behind
-the scene to connect to and communicate with session daemons. LTTng
-session daemons may either be started manually (`lttng-sessiond`) or
-automatically by the `lttng` command when needed. Trace data may
-be forwarded to the network and used elsewhere using an LTTng relay
-daemon (`lttng-relayd`).