The oplog is readable as mongos too
What changes in The oplog is readable as mongos too compared with MongoDB and what your application has to do.
This difference is of the Extension kind.
What MongoDB does
A mongos gives no access to the local database.
What TeselaDB does
With the mongos presentation, local.oplog.rs can be read.
What your application has to do
Nothing. Tools that read the oplog work with both presentations.