Kibana Service Infrastructure tab displays some empty fields

Observability → APM → Service Name → Infrastructure

This tab in kibana displays some empty fields f.e # of CPU, Memory Total, Memory usage. Same fields in the Observability → Infrastructure → Infrastructure Inventory → Host name display data correctly. Is there a way to see which queries kibana makes and to which index in order to populate such fields?

I guess I’ve found those using browser’s dev console