fix legends, add resolution, add statsseries, add simple healthcheck

internal/metricDataDispatcher/dataLoader.go

@@ -264,7 +264,7 @@ func LoadNodeListData(
 	from, to time.Time,
 	page *model.PageRequest,
 	ctx context.Context,
-) (map[string]map[string]map[schema.MetricScope]*schema.JobMetric, int, bool, error) {
+) (map[string]schema.JobData, int, bool, error) {
 	repo, err := metricdata.GetMetricDataRepo(cluster)
 	if err != nil {
 		return nil, 0, false, fmt.Errorf("METRICDATA/METRICDATA > no metric data repository configured for '%s'", cluster)
@@ -286,6 +286,19 @@ func LoadNodeListData(
 		}
 	}
 
+	// NOTE: New StatsSeries will always be calculated as 'min/median/max'
+	const maxSeriesSize int = 15
+	for _, jd := range data {
+		for _, scopes := range jd {
+			for _, jm := range scopes {
+				if jm.StatisticsSeries != nil || len(jm.Series) <= maxSeriesSize {
+					continue
+				}
+				jm.AddStatisticsSeries()
+			}
+		}
+	}
+
 	if data == nil {
 		return nil, totalNodes, hasNextPage, fmt.Errorf("METRICDATA/METRICDATA > the metric data repository for '%s' does not support this query", cluster)
 	}