Add cni-metrics-helper source code

[liwenwu-amazon]

*Issue #113 *

Description of changes:

cni-metrics-helper

The following show how cni-metrics-helper works in a cluster:

install cni-metrics-helper

kubectl apply -f misc/cni_metrics_helper.yaml

get cni-metrics-helper logs

kubectl get pod -n kube-system
NAME                                  READY     STATUS    RESTARTS   AGE 
aws-node-248ns                        1/1       Running   0          6h  
aws-node-257bn                        1/1       Running   0          2h  
...
cni-metrics-helper-6dcff5ddf4-v5l6d   1/1       Running   0          7h  
kube-dns-75fddcb66f-48tzn             3/3       Running   0          1d  

kubectl logs cni-metrics-helper-6dcff5ddf4-v5l6d -n kube-system

cni-metrics-helper key log messages

# following shows the aggregated metrics. this can be optionally sent to cloudwatch
I0516 17:11:58.489648       7 metrics.go:350] Produce GAUGE metrics: ipamdActionInProgress, value: 0.000000
I0516 17:11:58.489657       7 metrics.go:350] Produce GAUGE metrics: assignIPAddresses, value: 2.000000
I0516 17:11:58.489665       7 metrics.go:350] Produce GAUGE metrics: totalIPAddresses, value: 11186.000000
I0516 17:11:58.489674       7 metrics.go:350] Produce GAUGE metrics: eniMaxAvailable, value: 800.000000
I0516 17:11:58.489685       7 metrics.go:340] Produce COUNTER metrics: ipamdErr, value: 1.000000
I0516 17:11:58.489695       7 metrics.go:350] Produce GAUGE metrics: eniAllocated, value: 799.000000
I0516 17:11:58.489715       7 metrics.go:350] Produce GAUGE metrics: maxIPAddresses, value: 11200.000000

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dbenhur]

Why is binary cni-metrics-helper/cni-metrics-helper committed to source repo?

[vpm-bradleyhession]

Bump

can we please get this merged? Especially since pulling the image in misc/cni_metrics_helper.yaml results in an error.

Thanks,

[xdrus]

Can we also have a clear description of IAM permissions needed to publish metrics to CW? Is having "cloudwatch:PutMetricData" enough?

[mattlandis]

You can remove the apiserver parameter from the createKubeClient function since it is only used in one place and you are providing a constant value of an empty string.

[mattlandis]

As mentioned on the declaration, the nil parameter here isn't clean.

[mattlandis]

I don't see where this is used. I think it can be removed.

[liwenwu-amazon]

@vpm-bradleyhession we are still in the process of code reviewing. At meantime, you can checkout the source code of this PR and build it.

[liwenwu-amazon]

@xdrus cloudwatch:PutMetricData IAM should be enough to publish cloudwatch metrics. Please let me know if you see any issues thanks

[maxenglander]

Are there plans to move this forward or merge? My organization is exploring adopting EKS and we would like to have more insight and metrics into CNI.

[mogren]

Closing this PR in favor of #413