userAgentParts := []string{}
	// Helper function to concisely append a pair of strings to a
	// the user-agent slice.
	uaAppend := func(p, q string) {
		userAgentParts = append(userAgentParts, p, q)
	}
	uaAppend(MinioUAName, " (")
	uaAppend("", runtime.GOOS)
	uaAppend("; ", runtime.GOARCH)
	if mode != "" {
		uaAppend("; ", mode)
	}
	if IsDCOS() {
		uaAppend("; ", "dcos")
	}
	if IsKubernetes() {

        json.append("{");
        json.append("\"timestamp\":\"").append(escapeJson(entry.timestamp.toString())).append("\",");
        json.append("\"eventType\":\"").append(entry.eventType.name()).append("\",");
        json.append("\"severity\":\"").append(entry.severity.name()).append("\",");
        json.append("\"message\":\"").append(escapeJson(entry.message)).append("\"");

        if (!entry.context.isEmpty()) {

        buf.append(',').append('"').append(FieldNames.FIELDS).append("\":").append(convertJsonStrings(fields));
        buf.append(',').append('"').append(FieldNames.TAGS).append("\":").append(convertJsonStrings(tags));
        buf.append(',').append('"').append(FieldNames.ROLES).append("\":").append(convertJsonStrings(roles));
        buf.append(',').append('"').append(FieldNames.LANGUAGES).append("\":").append(convertJsonStrings(languages));
        buf.append(',')

            buf.append(',');
            buf.append("\"page_number\":");
            buf.append(currentPageNumber);
            buf.append(',');
            buf.append("\"record_count\":");
            buf.append(allRecordCount);
            buf.append(',');
            buf.append("\"record_count_relation\":");
            buf.append(escapeJson(allRecordCountRelation));
            buf.append(',');
            buf.append("\"page_count\":");

            buf.append('"').append(StringEscapeUtils.escapeJson(format)).append('"');
        } else if (value instanceof String[]) {
            final String json = Arrays.stream((String[]) value)
                    .map(s -> "\"" + StringEscapeUtils.escapeJson(s) + "\"")
                    .collect(Collectors.joining(","));
            buf.append('[').append(json).append(']');
        } else if (value instanceof List) {

        buf.append("{\"@timestamp\":\"").append(valueMap.remove("time")).append('"');
        buf.append(",\"log.level\":\"INFO\"");
        buf.append(",\"ecs.version\":\"").append(ecsVersion).append('"');
        buf.append(",\"service.name\":\"").append(ecsServiceName).append('"');
        buf.append(",\"event.dataset\":\"").append(ecsEventDataset).append('"');

		case HasOne:
			schema.Relationships.HasOne = append(schema.Relationships.HasOne, relation)
		case HasMany:
			schema.Relationships.HasMany = append(schema.Relationships.HasMany, relation)
		case BelongsTo:
			schema.Relationships.BelongsTo = append(schema.Relationships.BelongsTo, relation)
		case Many2Many:
			schema.Relationships.Many2Many = append(schema.Relationships.Many2Many, relation)
		}
	}

        switch (errorClass) {
        case SUCCESS:
            result.append("SUCCESS");
            break;
        case ERR_NAM_SRVC:
            result.append("ERR_NAM_SRVC/");
            switch (errorCode) {
            case FMT_ERR:
                result.append("FMT_ERR: Format Error");
            default:
                result.append("Unknown error code: ").append(errorCode);
            }
            break;

            if (values == null) {
                // nothing
            } else if (values.length == 1) {
                queryBuf.append(' ').append(key).append(":\"").append(values[0]).append('\"');
            } else if (values.length > 1) {
                boolean first = true;
                queryBuf.append(" (");
                for (final String value : values) {
                    if (first) {
                        first = false;

        monitorTarget.append(buf, "key1", () -> "value1");
        buf.append(",");
        monitorTarget.append(buf, "key2", () -> 123);
        buf.append(",");
        monitorTarget.append(buf, "key3", () -> null);

        assertEquals("\"key1\":\"value1\",\"key2\":123,\"key3\":null", buf.toString());
    }

    // Test append with empty string
    public void test_append_emptyString() {