public int getUserDefinedAttributesCount() {
            return internalGetUserDefinedAttributes().ensureBuilderMap()
                    .size();
        }
<code>optional int64 mute_end_date = 6;</code>

@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/group/CreateGroupRequest.java