[dbg] make simple tracer() remsh-friendly #9589
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`dbg:tracer()` as shown in getting started was printing everything via local `user` process. This made trace messages invisible over remsh unless tracer was explicitly configured. This commit makes default trace use group_leader, making it less surprising for remsh users.
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The problem
Consider following
dbggetting started guide https://www.erlang.org/doc/apps/runtime_tools/dbg.htmlIf performed over remsh (e.g. when debugging a production node), default tracer prints all its messages to
userprocess on the main node. This leads to no data printed to the shell which started the tracer, making dbg unusable for novice remsh users.Solution
In this PR I make default tracer aware of remsh, and when remsh is detected, the output is sent to remote group_leader.
For local calls behaviour stays as before -- default output is
userprocess.