How to config alert rule once on all instance

my server info:
centos 7 x64, grafana 8.0.4 enable ngalert feature

prometheus scrape config:

- job_name: myserversjob
  - targets: ['server1:9100','server2:9100','server3:9100','server4:9100']

Create alert rule on grafana webui:
create query name A with node_filesystem_free_bytes{job=“myserversjob”}
create query name B with node_filesystem_size_bytes{job=“myserversjob”}
create math expr name C with expr: $A/$B<0.2

The data of A and B is ok , and can preview in time series graph, but the value of C is always no data。

Am i do the wrong step?

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