SERVER-5092 introduced log components for finer-grained control over output of LOG() messages.
These log components will be extended into a hierarchy namespace in SERVER-14415 and will be configured using setParameter (BSON support to be added in SERVER-14416)

• Add logComponentVerbosity to the list of server parameters in setParameter
• Every log component will have a corresponding YAML configuration option with the name systemLog.component.<component dotted name>.verbosity. Dotted name of each log component includes names ancestor components up to but not include the Default component. For complete list, see LogComponent::Value enumeration in src/mongo/logger/log_component.h. Currently, the complete list of YAML options for log components is:
  • systemLog.component.accessControl.verbosity
  • systemLog.component.commands.verbosity
  • systemLog.component.indexing.verbosity
  • systemLog.component.networking.verbosity
  • systemLog.component.query.verbosity
  • systemLog.component.replication.verbosity
  • systemLog.component.sharding.verbosity
  • systemLog.component.storage.verbosity
  • systemLog.component.storage.journaling.verbosity
  • systemLog.component.writes.verbosity
  • systemLog.component.geo.verbosity
  • systemLog.component.control.verbosity
• Server Logging Rules will need to incorporate the information from the logging section of the updated Kernel Code Style: