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Change prometheus metrics type from summary to histogram
The summary types are tagged for deprecation, Kubernetes recommended to use histograms instead of summaries. The main advantages of histogram types are aggregation and inexpensive. In this commit, we changed three Antrea controller metrics from summary to histogram type. They are DurationAppliedToGroupSyncing, DurationAddressGroupSyncing, and DurationInternalNetworkPolicySyncing. Fixes #905
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