How to monitor number of pods or containers?

[Vitaly Karasik]

I use Kubernetes Horizontal Pod Autoscaling (HPA) and I'd like to build a graph with the number of pods (or containers) in this HPA configuration. 

Is there a proper way to build such metric?

The only workaround I found so far is using "count" aggregation for 'kubernetes containers' resource,  'uptime' metric. Graph based on this metric provides realistic values on small time intervals, while uses 'mean over 1 minute window'.  But value is wrong when it switches to 'mean over 1 hour window'.

TIA,

Vitaly

[Shoucong Chen]

Hi Vitaly,

Using "count" aggregation over an always-existed container / pod metric is still the recommended way to generate charts for number of containers / pods.

I can reproduce the wrong chart when "mean over 1 hour window" on "uptime" metric. It seems a bug and we will investigate. Thanks for notifying us!

In the meantime, you can probably choose a different metric (like "cpu usage time") to achieve your goal.

Please let me know if you have additional questions!

Best,

Shoucong

[linux.il]

>Using "count" aggregation over an always-existed container / pod metric is still the recommended way 

I suspect it doesn't work by design for *not*  always-existed container / pod, and this is exactly situation with autoscaling. For instance, if we have my autoscaling fluctuating between 9 and 10 pods every  5 minutes, we'll see 9 'permanent' and 6 'temporary' pods during 1 hour, i.e. metric will be 15 instead of 9.5.

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