update for this case: specify the server want to collect, in my example is dc-tdi-redis02 here is full path Application Infrastructure Performance|Root|Individual Nodes|dc-tdi-redis02|Custom Metrics|Redis|dc-tdi-redis02|Clients|blocked_clients when i try select from Hardware resouces, it will show: Hardware Resources|CPU|%Busy so let remove "Application Infrastructure Performance|Root|Individual Nodes|dc-tdi-redis02|", it will work now Thanks everyone!!! Phucdq from Vietnam with love!!
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