Use batch/v1 API & Add /health endpoint & Fix CronJob OwnerRef

[floreks]

Fixes #7289
Fixes #7251
Fixes #7207

Additionally removed support for heapster as a metric provider.

[codecov]

Codecov Report

Merging #7301 (81f32a4) into master (388e0b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7301   +/-   ##
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  Coverage   44.22%   44.22%           
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  Files          46       46           
  Lines        1282     1282           
  Branches      161      161           
=======================================
  Hits          567      567           
  Misses        715      715           

[maciaszczykm]

/lgtm

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[erwbgy]

@floreks @maciaszczykm et al, please could you put out a 2.7.1 release that includes this fix?

[mimmus]

As a fact, I have v.2.7.0 (latest before 3.0.0-alpha0) but the issue is still here.
In k8s audit logs, I can see:

{"kind":"Event","apiVersion":"audit.k8s.io/v1","level":"Request","auditID":"b4f588f0-0c23-4a70-9fbc-a3c222c92126","stage":"ResponseComplete","requestURI":"/apis/batch/v1beta1/namespaces/xxxxxxx-document/cronjobs/xpres-sync","verb":"get",...,
{"resource":"cronjobs","namespace":"xxxxxxx-document","name":"xpres-sync","apiGroup":"batch","apiVersion":"v1beta1"},"responseStatus":{"metadata":{},"status":"Failure","message":"the server could not find the requested resource","reason":"NotFound","details":{},"code":404}
}