Request URI too large for Grafana - kubernetes dashboard-CodePudding

We are running nearly 100 instances in Production for kubernetes cluster and using prometheus server to create Grafana dashboard. To monitor the disk usage , below query is used

(sum(node_filesystem_size_bytes{instance=~"$Instance"}) - sum(node_filesystem_free_bytes{instance=~"$Instance"})) / sum(node_filesystem_size_bytes{instance=~"$Instance"})

As Instance ip is getting replaced and we are using nearly 80 instances, I am getting error as "Request URI too large".Can someone help to fix this issue

CodePudding user response：

You only need to specify the instances once and use the on matching operator to get their matching series:

(sum(node_filesystem_size_bytes{instance=~"$Instance"})
  - on(instance) sum(node_filesystem_free_bytes))
/ on(instance) sum(node_filesystem_size_bytes)

Consider also adding a unifying label to your time series so you can do something like ...{instance_type="group-A"} instead of explicitly specifying instances.