fix nil panics parsing hpa cpu current metrics #993
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: brancz, tariq1890 The full list of commands accepted by this bot can be found here. The pull request process is described here
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This PR fixes a nil de-referencing issue here.
The root cause of this issue is a nil metric element being added to the metric family slice. These nil metrics are added when parsing
kube_hpa_status_current_metrics_average_valueCPU metrics. This is because CPU metrics need to be handled differently owing to the fact that they are scaled metrics.