Divide node_exporter loadavg by CPU count doesn't show anything

[Ray Wu]

I want to divide node_loadN by number of CPUs.

Both queries 

  node_load1{instance="hostname"}

and 

  count(node_cpu_seconds_total{instance="hostname",mode="idle"})

Returns expected results. But for query

  node_load1{instance="hostname"} / count(node_cpu_seconds_total{instance="hostname",mode="idle"})

,the returned result is empty. What did I do wrong?

[Ray Wu]

While reading other document, I found that both time series need to have matching labels. 

I have an extra label "region" for all metrics.

Aggregate on denominator "mode" doesn't make it work

  node_load5{instance="host"} / 

  sum without (mode) (count(node_cpu_seconds_total{instance="host",mode="idle"}))

The following query works thought

  sum without (instance, job, region) (node_load1{instance="host"}) / 

  sum without (mode) (count(node_cpu_seconds_total{instance="host",mode="idle"}))

but I really don't understand why

[Ben Kochie]

You need to remove both cpu and mode for the labels to match:

node_load1 / count without (cpu,mode) (node_cpu_seconds_total{mode="idle"})

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[Ray Wu]

I see, thanks!

On Sunday, June 14, 2020 at 12:54:33 AM UTC-7, Ben Kochie wrote:

You need to remove both cpu and mode for the labels to match:

node_load1 / count without (cpu,mode) (node_cpu_seconds_total{mode="idle"})

On Sun, Jun 14, 2020 at 1:16 AM Ray Wu <ray...@gmail.com> wrote:

While reading other document, I found that both time series need to have matching labels. 

I have an extra label "region" for all metrics.

Aggregate on denominator "mode" doesn't make it work

  node_load5{instance="host"} / 

  sum without (mode) (count(node_cpu_seconds_total{instance="host",mode="idle"}))

The following query works thought

  sum without (instance, job, region) (node_load1{instance="host"}) / 

  sum without (mode) (count(node_cpu_seconds_total{instance="host",mode="idle"}))

but I really don't understand why

On Saturday, June 13, 2020 at 2:09:31 PM UTC-7, Ray Wu wrote:

I want to divide node_loadN by number of CPUs.

Both queries 

  node_load1{instance="hostname"}

and 

  count(node_cpu_seconds_total{instance="hostname",mode="idle"})

Returns expected results. But for query

  node_load1{instance="hostname"} / count(node_cpu_seconds_total{instance="hostname",mode="idle"})

,the returned result is empty. What did I do wrong?

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