For your sourcetype, I think first of all you could try :
SHOULD_LINEMERGE=false;
and you can define :
BREAK_ONLY_BEFORE=^\d\d:\d\d:\d\d
which présents time
OR you could try LINE_BREAKER=
Use preview when you add data to make sure the indexation is ok, otherwise you have to clean up the index and reindex.
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