UserId, CID in measurement protocol
问题 Measurement protocol To Identify a new user vs. returning user , can we use the user id field . ( i.e we can hash username or other identifier unique to the user and associate it with a particular user . This way we can identify new users vs. returning users effectively. Question on CID -- CID is used to indentify a user's session uniquely till the session expires. Do we have to track the session expiration manually to generate cid per user session ? Pls clarify 回答1: A long time after but