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cleanup terminal console iopub handling...
cleanup terminal console iopub handling ensures IOPub for a given cell is handled before drawing the next prompt. Follows logic elsewhere using `status=idle` to signal end of output for a given cell. Prior to this, early execute reply could result in some output being printed after the prompt for the next input.

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logtopics.rst
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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