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With current design, we could not distinguish between previously existing deleted server and a new server reusing the deleted server name/id. This can cause some confusion when auditing stats/events/logs, because the new server will look similar to the old one. To address this, we're adding a new value in server structure: rid rid (revision id) value is an unsigned 32bits value that is set upon server creation. Value is derived from a global counter that starts at 0 and is incremented each time one or multiple server deletions are followed by a server addition (meaning that old name/id reuse could occur). Thanks to this revision id, it is now easy to tell whether the server we're looking at is the same as before or if it has been deleted and re-added in the meantime. (combining server name/id + server revision id yields a process-wide unique identifier)