In productionbeginnerProcess lifecycle
The node appears missing
Determine why `/scan_filter` is absent without reinstalling or rebuilding the workspace.
Pairs with Evidence before editing in ROS 2 Systems Debugging. Read the concept first, then diagnose it here.
Open repair workspaceOperator report
The launch command returns successfully, but `/scan_filter` is absent from `ros2 node list`.
Ubuntu 24.04, ROS 2 Jazzy, Python and C++ nodes, browser telemetry workspace
System boundary
Trace only the relevant path.
launch servicescan_filter processROS node graph
How this lab works
You diagnose it — no command list.
Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you — finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.
Verification
Your repair must pass more than the visible symptom.
- Process remains active
- Required node is discovered
- Hidden regression behavior
- Root cause explanation