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update pod metrics docs after review 

Signed-off-by: cedric lamoriniere <cedric.lamoriniere@datadoghq.com>
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cedric lamoriniere 2020-02-05 21:24:02 +01:00
parent 02844c3293
commit 311c6821c1
2 changed files with 5 additions and 5 deletions
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8
docs/pod-metrics.md
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@ -44,17 +44,17 @@
### How to retrieve none standard Pod state
It is not straightforward to get the Pod states for certain cases like "Terminating" and "Unknow" since it is not stored behind a field in the `Pod.status`.
It is not straightforward to get the Pod states for certain cases like "Terminating" and "Unknown" since it is not stored behind a field in the `Pod.Status`.
So to get them, you need to compose multiple metrics (like it is done in the `kubectl` command line).
So to get them, you will need to compose multiple metrics (like it is done in the `kubectl` command line code).
For example:
* To get the list the Pods that are in an `Unknow` state you can to the following promQL query: `count(kube_pod_status_phase{phase="Running"}) by (namespace, pod) * count(kube_pod_status_reason{reason="NodeLost"}) by(namespace, pod)`
* To get the list of pods that are in the `Unknown` state, you can run the following promQL query: `count(kube_pod_status_phase{phase="Running"}) by (namespace, pod) * count(kube_pod_status_reason{reason="NodeLost"}) by(namespace, pod)`
* For Pods in `Terminated` state: `count(kube_pod_status_phase{phase="Running"}) by (namespace, pod) * count(kube_pod_deleted) by (namespace, pod) * count(kube_pod_status_reason{reason!="NodeLost"})) by (namespace, pod)`
A useful "Rule" can be to be alerted when a Pod is blocked in `Terminated` state for more than `5m`.
Here is an example of a Prometheus rule that can be used to alert on a Pod that has been in the `Terminated` state for more than `5m`.
```yaml
groups:

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internal/store/pod_test.go
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@ -1605,7 +1605,7 @@ func BenchmarkPodStore(b *testing.B) {
},
}
expectedFamilies := 41
expectedFamilies := 37
for n := 0; n < b.N; n++ {
families := f(pod)
if len(families) != expectedFamilies {