The wiki pages are not used for documentation any more. Please visit http://bookkeeper.apache.org/docs/latest/admin/metrics/ for latest documentation.
When a client adds an entry to a ledger, it sends requests to write that entry to all bookies in a quorum. Once the request reaches the bookie, a good place in the code to start looking is Bookie.addEntryInternal(). Following the steps, we observe essentially the following: