Correct ordering of metrics
Correct the ordering of metrics on performance dashboard. Before common metrics were moved into the DB, metric groups were ordered by the priority defined in the common_metrics.yml file. This commit adds a priority to each metric group in the PrometheusMetric model. It also combines title, priority and required_metrics into one frozen GROUP_DETAILS hash so that the code is clearer. This can be done since there is a fixed set of groups which are not configurable.
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