Bug in the oplog for remove. All other queries follow the syntax:

[Timestamp] [connection#] [update|remove|insert] [ns] query:

{....}

byid 0ms

Example:
Thu Aug 19 18:55:54 [conn8] query mydb.users ntoreturn:1 reslen:341 nreturned:1 0ms
Thu Aug 19 18:55:56 [conn8] update mydb.users query:

{ _id: ObjectId('4c564b4c4d784c0efa0000ad') }

byid 0ms

However a remove is coming up like:
Thu Aug 19 19:02:22 [conn28] remove query: { _id:

{ $in: [ ObjectId('4c6d736853cc91398500000c') ] }

} 0ms

Missing the namespace that the object was removed from.