Currently there is some information about the fields in oplog_entry.idl, but it could be helpful to have add some more visual examples in the Repl arch guide of what an oplog entry for some common commands (like create, insert, etc) would look in a log or when queried from the oplog collection, along with a definition of what the fields represent (similar to how in the official MongoDB docs there are example syntax for a command along with a description of the input parameters).

There are some example oplog entries for some DDL operations here that we could use