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DEV: Set `klass=object` for Log{in,out}Handler....
DEV: Set `klass=object` for Log{in,out}Handler. It seems plausible that people will implement custom handlers that aren't subclasses of a known type. Another possible option would be `IPythonHandler`, but even that feels too restrictive.
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute