Abstract: Systems for selective logging events in a network. In particular implementations, a method includes receiving indications of events associated with a network application; selectively flagging one or more of the events for logging; and applying the events to a processing stream comprising a plurality of process modules. The process modules are operative to receive events from another process module; apply one or more operations in response to the received events; and conditionally transmit one or more log messages identifying flagged events to a log data store.