Query for Memory usage in singlestat panel (in grafana)

Grafana Stat Panel
1

Please provide query for MEMORY USAGE aggregation of multiple servers in singlestat panel.

Im using below query but not working in singlestat panel (it is giving data on Prometheus)
((node_memory_MemTotal{job=“api-server”} - node_memory_MemFree{job=“api-server”} - node_memory_Cached{job=“api-server”}) / (node_memory_MemTotal{job=“api-server”} )) * 100

Could you please provideproper query for multple servers memor usage aggregation in grafana.
Error:

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2

don’t know prometheus query language that well, might be better to ask in prometheus forum.

3

Or maybe someone who knows prometheus really well will see this and answer you .)