LTLOG — Adding some filtering capabilities to the Lightweight Logging Service

In order to add some possibilities to filter records, we would like methods
that retrieve log records according to the fields defined in struct
ProducerLogRecord (namely the level, producerId and producerName).
That would consist in the three following methods to be added on the
LogConsumer object.
That point has been discussed during the Yokohama meeting with the
supporters of this submission (in particular with Jeff Smith) and no
difficulty to add these methods was foreseen.

see above