thx for your support, the result :
apache2.conf:# LogLevel: Control the number of messages logged to the error_log.
apache2.conf:LogLevel crit
sites-available/default: LogLevel warn
sites-available/site.com.vhost: LogLevel crit
sites-available/default-ssl: LogLevel warn
sites-available/roundcube: LogLevel warn
sites-enabled/site.com.vhost: LogLevel crit
sites-enabled/default-ssl: LogLevel warn
sites-enabled/roundcube: LogLevel warn
sites-enabled/000-default: LogLevel warn
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