/usr/share/diagnostic_msgs/msg/DiagnosticStatus.msg is in ros-diagnostic-msgs 1.12.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # This message holds the status of an individual component of the robot.
#
# Possible levels of operations
byte OK=0
byte WARN=1
byte ERROR=2
byte STALE=3
byte level # level of operation enumerated above
string name # a description of the test/component reporting
string message # a description of the status
string hardware_id # a hardware unique string
KeyValue[] values # an array of values associated with the status
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