RejectionLog
The one shape of a command's rejection in the log, under the logger CATEGORY: a readable message, and the fields as SLF4J key-values named as the spans' attributes name them (CONTEXT, AGGREGATE, COMMAND, ERROR_TYPE, REQUEST_ID, and WITH_EVENTS for a decision's). A decision's rejection is a business outcome, at INFO (rejected); an admission's refusal is the gateway's ordinary work, at DEBUG (refused).