How to troubleshoot mongo sharded environment like query slow

Ops and Admin Sharding
5 
rs2:PRIMARY> db.serverStatus().globalLock
{
        "totalTime" : NumberLong("2535707000"),
        "currentQueue" : {
                "total" : 2430,
                "readers" : 0,
                "writers" : 2430
        },
        "activeClients" : {
                "total" : 167,
                "readers" : 30,
                "writers" : 137
        }
}
rs2:PRIMARY>
4:18
rs1:PRIMARY> db.serverStatus().globalLock
{
        "totalTime" : NumberLong("11815012000"),
        "currentQueue" : {
                "total" : 0,
                "readers" : 0,
                "writers" : 0
        },
        "activeClients" : {
                "total" : 10,
                "readers" : 5,
                "writers" : 5
        }
}
rs1:PRIMARY>