/usr/share/rosgraph_msgs/msg/Log.msg is in libros-rosgraph-msgs-dev 1.11.1-3.
This file is owned by root:root, with mode 0o644.
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## Severity level constants
##
byte DEBUG=1 #debug level
byte INFO=2 #general level
byte WARN=4 #warning level
byte ERROR=8 #error level
byte FATAL=16 #fatal/critical level
##
## Fields
##
Header header
byte level
string name # name of the node
string msg # message
string file # file the message came from
string function # function the message came from
uint32 line # line the message came from
string[] topics # topic names that the node publishes
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