Add example launch file

[dabonnie]

Add a new launch file for composable nodes. The purpose is to demo measuring a ROS2 process's CPu and memory usage.

Signed-off-by: Devin Bonnie dbbonnie@amazon.com

[thomas-moulard]

This seems to have a lot of overhead compared to having a simple subdirectory - what is the intent?

[dabonnie]

This seems to have a lot of overhead compared to having a simple subdirectory - what is the intent?

Do you mean overhead from the package requirements? If so this is done so the examples, via the current README, can be run by only building the system_metrics_collector_examples package. I found this to be useful when building using packages-up-to.

Also note that I intend to add another launch file, but as a separate PR to reduce scope here.

[dabonnie]

This seems to have a lot of overhead compared to having a simple subdirectory - what is the intent?

Do you mean overhead from the package requirements? If so this is done so the examples, via the current README, can be run by only building the system_metrics_collector_examples package. I found this to be useful when building using packages-up-to.

Also note that I intend to add another launch file, but as a separate PR to reduce scope here.

Per offline discussion with @thomas-moulard: I'll modify this PR to simply add a new directory but not a new package. This reduces the amount of boilerplate to maintain.

[piraka9011]

LGTM, thanks for making the changes!

[codecov]

Codecov Report

Merging #81 into master will decrease coverage by 0.05%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
- Coverage    39.3%   39.24%   -0.06%     
==========================================
  Files          33       33              
  Lines        1346     1348       +2     
  Branches      809      811       +2     
==========================================
  Hits          529      529              
  Misses         62       62              
- Partials      755      757       +2

Flag	Coverage Δ
#unittests	39.24% <0%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
...ollector/linux_process_memory_measurement_node.cpp	35.71% <0%> (-1.33%)	⬇️
...s_collector/linux_process_cpu_measurement_node.cpp	61.9% <0%> (-3.1%)	⬇️

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[thomas-moulard]

SGTM - minor nits

[thomas-moulard]

Check also whether you'd like to install examples or not. That would need you to update the CMakeListst.txt