Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / syslog / config / install / syslog.settings.yml

identity: drupal
# The default facility setting depends on the operating system, and will be
# overwritten during installation.
# @see syslog_install().
facility: 8
format: '!base_url|!timestamp|!type|!ip|!request_uri|!referer|!uid|!link|!message'