Currently portabled is completely silent (when not using debug level). But when the system state is changed (ie: a portable is attached or detached) there are no traces left in the journal. Log at info level when either of those operations succeed, as they are effectively changing the state of the system. Create new MESSAGE_IDs for these logs, and also append PORTABLE_ROOT= (and PORTABLE_EXTENSION= if any), like the units themselves are configured to do via LogExtraFields=, so that the same metadata can be found in the attach/detach messages and in logs from the units themselves.
System and Service Manager
Details
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