"repl" : {
	"apply" : { //applied operations on the replica (not primary)
		"batches" : {
			"num" : ##, //number of batches applied across all db active in the batch
			"totalMillis" : ## //time to apply
		},
		"ops" : ## //applied operations
	},
	"buffer" : { //stuff to be applied, came off the network and in a holding pattern till the application threads start to work on it.
		"count" : ##, //current count items in the buffer 
		"maxSizeBytes" : ##, //max size of the buffer, in bytes
		"sizeBytes" : ## //current size of the buffer, in bytes
	},
	"network" : { //network stats during replication from the source
		"bytes" : ##, //the amount of data read from the replication source
		"getmores" : {
			"num" : ##, //number of getmore (batches) made to the source
			"totalMillis" : ## //time taken to collect the data
		},
		"ops" : ##, //number of ops read from the source oplog
		"readersCreated" : ## //number of oplog readers created -- this will happen if any error occurs on the connection (timeout, network loss, etc), if a new source is used for example
	},
	"oplog" : {
		"insert" : {
			"num" : ##, //entries inserted into the oplog
			"totalMillis" : ## //time take to do the inserts
		},
		"insertBytes" : ## //the size (in bytes) that were inserted
	},
	"preload" : { //these number depend on the prefetch mode
		"docs" : {
			"num" : ##, //documents which were loaded before being updated
			"totalMillis" : ## //time taken to load the docs
		},
		"indexes" : {
			"num" : ##, //number of index entries loaded before updating the docuemtnes
			"totalMillis" : ## //time taken to load the index entries
		}
	}
}