This question already has an answer here:
The first noncomment line in a legacy crontab file begins with five asterisks:
* * * * * ([a_command]) >/dev/null 2>&1
The authors are gone, so I do not know their intent. What does all-wildcards mean to (Solaris 8) cron? The betting here is either run once, run continuously, or run never, which is unfortunately broad.
If you are wondering about the comment line preceding this, it is "Do not delete."
Note: This cron file is working. This question is not a duplicate of a question about broken cron files or cron files which require troubleshooting.