​"NameNode Service RPC Queue Latency (Hourly)" and "NameNode Service RPC Queue Latency (Hourly)" are "UNKNOWN".

[#1]

"NameNode Service RPC Queue Latency (Hourly)" and "NameNode Service RPC Queue Latency (Hourly)" are "UNKNOWN". Both alerts show "Service RPC port is not enabled.", but NameNodes are running without problems. (NameNodes are configured HA.) Do I have to ignore these alerts? But If possible, I want to turn these alerts to "OK".

[#2 · Accepted solution]

You can safely ignore this warning if you don't have enabled service RPC. This is dedicated port in Namenode, datanode will send liveness and block report to this queue. The port is never used by client applications hence it reduces RPC queue contention between client requests and DataNode messages.

You can ref this link for more, Scaling Namenode.

[#3]

Thank you very much, @Karthik Palanisamy

That link is also very helpful.