first commit

web/core/modules/syslog/syslog.install

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+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the syslog module.
+ */
+
+/**
+ * Implements hook_install().
+ */
+function syslog_install() {
+  // The default facility setting depends on the operating system, so it needs
+  // to be set dynamically during installation.
+  \Drupal::configFactory()->getEditable('syslog.settings')->set('facility', defined('LOG_LOCAL0') ? LOG_LOCAL0 : LOG_USER)->save();
+}
+
+/**
+ * Convert syslog.settings.facility to an integer.
+ */
+function syslog_update_8400() {
+  $config = \Drupal::configFactory()->getEditable('syslog.settings');
+  $facility = (int) $config->get('facility');
+  $config->set('facility', $facility)->save(TRUE);
+}