metrics.repl.network.oplogGetMoresProcessed reports the total amount of replication oplog fetching getMore processed by a node as a sync source.
metrics.repl.network.oplogGetMoresProcessed.num reports the number of replication oplog fetching getMore commands processed.
metrics.repl.network.oplogGetMoresProcessed.totalMillis reports the amount of time spent on processing those getMore commands.
Note that metrics.repl.network.oplogGetMoresProcessed is a metrics on sync sources whereas metrics.repl.network.getmores is a metrics on syncing nodes.