Why rosgraph_msgs/Log contains field `topic` ?

[flplv]

If you use nodelets you will often load a lot of different applications within the same node, and the topic field for every rosout message can be huge.

On our system, we are transferring through the wire 45KiB of extra payload per console message only because of the topic list.

[dirk-thomas]

I am not sure if you have seen the ROS support guidelines but we kindly ask to raise questions like this on answers.ros.org instead.

The rational for asking all kind of questions in a single place is:

• There are many more people reading questions there so your chances on getting an answer and in a timely manner are much higher.
• In the future other users will search there for similar problems and can find your question and the potential answers.
• The issue tracker in this repo is used to track bugs, feature requests, etc. But your question is not such an action item.

Therefore I will close this ticket here for now.

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There seems to be a question asking for exactly what you are looking for: https://answers.ros.org/question/301590/how-to-always-load-a-parameter-without-adding-it-to-every-launch-file/