eca-1.0.x-dev/modules/log/config/schema/eca_log.schema.yml

eca.event.plugin.log:log_message:
  type: eca.event.plugin
  label: 'Log Message'
  mapping:
    channel:
      type: string
      label: 'Type'
    min_severity:
      type: integer
      label: 'Minimum severity'
      constraints:
        # @see \Drupal\Core\Logger::getLevels()
        Choice: [0, 1, 2, 3, 4, 5, 6, 7]

action.configuration.eca_write_log_message:
  type: mapping
  label: 'Configuration for the "Write Log Message" action'
  mapping:
    channel:
      type: string
      label: 'Type'
    severity:
      type: integer
      label: 'Severity'
      constraints:
        # @see \Drupal\Core\Logger::getLevels()
        Choice: [0, 1, 2, 3, 4, 5, 6, 7]
    message:
      type: text
      label: 'Message'