UNKN - Item not found in SNMP data

Hello Community.
In my company, we are trying to reduce the number of service alerts generated by switches. We want to reduce these alerts which show up on the main overview.

One alert we really want to get rid of is the power supply service going from “OK” to “UNKN - Item not found in SNMP data”. This also triggers the Check_MK service to give “WARN - [snmp] Success, Missing agent sections: netextreme_psu_inWARN ,”.

How can we remove these alerts.
Thanks in advance

This picture shows what I am talking about

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