Beginning with Oracle Database 11g release 2 (11.2), certain Oracle Clusterware messages contain a text identifier surrounded by "(:" and ":)". Usually, the identifier is part of the message text that begins with "Details in..." and includes an Oracle Clusterware diagnostic log file path and name similar to the following example. The identifier is called a DRUID, or diagnostic record unique ID:
2014-07-16 00:18:44.472 [ORAROOTAGENT(13098)]CRS-5822:Agent '/scratch/12.1/grid/bin/orarootagent_root' disconnected from server. Details at (:CRSAGF00117:) in /scratch/12.1/grid/log/stnsp014/agent/crsd/orarootagent_ root/orarootagent_root.log.
DRUIDs are used to relate external product messages to entries in a diagnostic log file and to internal Oracle Clusterware program code locations. They are not directly meaningful to customers and are used primarily by My Oracle Support when diagnosing problems.