[Metrics scraper] How to disable the access log?

[maciaszczykm]

Environment
Installation method: kubectl apply
Kubernetes version: 1.14
Dashboard version: 2.0.0-b4
Operating system: Linux
Steps to reproduce
Run the sidecar inside the dashboard pod::

    args:
      - --metric-resolution=30s
      - --log-level=warn
    ports:
    - containerPort: 8000
      name: http
    livenessProbe:
      httpGet:
        scheme: HTTP
        path: /
        port: http
      initialDelaySeconds: 30
      timeoutSeconds: 30

Get logs:
kubectl -n kube-system logs svc/kubernetes-dashboard -c dashboard-metrics-scraper

Observed result
10.0.7.85 - - [20/Sep/2019:23:47:15 +0000] "GET / HTTP/1.1" 200 6 "" "kube-probe/1.13"
10.0.7.85 - - [20/Sep/2019:23:47:25 +0000] "GET / HTTP/1.1" 200 6 "" "kube-probe/1.13"
127.0.0.1 - - [20/Sep/2019:23:47:31 +0000] "GET /healthz?timeout=32s HTTP/1.1" 200 25 "" "dashboard/v0.0.0 (linux/amd64) kubernetes/$Format"
Expected result
An empty log except for warning messages.

Comments
Looks like the sidecar uses gorilla combined logging handler. Couldn't find a way to disable it.
That format is inconsistent with the rest of the k8s components which use klog. Makes writing a parser harder than it should be.
kubernetes/kubernetes#61006
https://github.com/kubernetes/klog

Opened by @mindw.

See kubernetes-sigs/dashboard-metrics-scraper#21 for more details.

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[mindw]

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[maciaszczykm]

Metrics scraper is using klog now. You can also easily configure logging levels now.