public SuspensionReasons mergeWith(SuspensionReasons that) {
        for (var entry : that.reasons.entrySet()) {
            for (var reason : entry.getValue()) {
                addReason(entry.getKey(), reason);
            }
        }

        return this;
    }
An ordered list of all messages, typically useful for testing.
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/policy/SuspensionReasons.java