Fix PHP notice: Undefined index: samples #1
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collectHistograms() in the storage adapters does not define ['samples'] as the default array keys and as such a notice is thrown when the MetricFamilySamples::__construct($data) is called when no samples are available.
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collectHistograms() in the storage adapters does not define ['samples'] as the default array keys and as such a notice is thrown when the MetricFamilySamples::__construct($data) is called when no samples are available.