| EventManagerImpl | 
 NOTE: This is an in-memory event collector, but it's not currently used. 
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| LogEvent | 
 This is a general purpose representation of a logging event. 
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| LoggingManagerImpl | 
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| LoggingSystemTurboFilter | 
 This is our main filter in the logging system. 
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| LoggingSystemTurboFilter.MDCKeyFilter | 
 We can do 2 things: 1) set levels for specific property values (which
 bypass/ignore logger levels) 2) set property filters, so that events only
 pass when the property matches. 
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| LogQueryConfig | 
 A set of parameters for querying the logging system. 
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| LogQueryConfig.LogQueryConfigBuilder | 
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| LogQueryConfig.PropertyFilter | 
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| LogResults | 
 The results of a query to the logging system. 
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| MDCUtils | 
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| MDCUtils.MDCDetails | 
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| SystemEventFilter | 
 Filters to only logging events that are "system events", or get logged with a "system" marker. 
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