INFO, WARNING, ERROR, FATAL
Logging a FATAL message terminates the program (after the message is logged)
a message of severity FATAL will be logged to the logfiles of severity FATAL, ERROR, WARNING, and INFO.
The DFATAL severity logs a FATAL error in debug mode
glog writes to the filename /tmp/\<program name>.\<hostname>.\<user name>.log.\<severity level>.\<date>-\<time>.\<pid>
https://github.com/google/glog/blob/master/README.rst#user-guide
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