statstics: fix wrong stats health metrics (#57555)

close #57176

Author: hawkingrei

pkg/statistics/handle/cache/statscache.go

@@ -261,7 +261,7 @@ func (s *StatsCacheImpl) UpdateStatsHealthyMetrics() {
 	distribution := make([]int64, 9)
 	uneligibleAnalyze := 0
 	for _, tbl := range s.Values() {
-		distribution[4]++ // total table count
+		distribution[7]++ // total table count
 		isEligibleForAnalysis := tbl.IsEligibleForAnalysis()
 		if !isEligibleForAnalysis {
 			uneligibleAnalyze++

pkg/statistics/handle/metrics/metrics.go

@@ -34,16 +34,15 @@ func init() {
 // InitMetricsVars init statistics metrics vars.
 func InitMetricsVars() {
 	StatsHealthyGauges = []prometheus.Gauge{
-		metrics.StatsHealthyGauge.WithLabelValues("[0,50)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[50,55)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[55,60)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[60,70)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[70,80)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[80,100)"),
-		metrics.StatsHealthyGauge.WithLabelValues("[100,100]"),
-		// [0,100] should always be the last
-		metrics.StatsHealthyGauge.WithLabelValues("[0,100]"),
-		metrics.StatsHealthyGauge.WithLabelValues("unneeded analyze"),
+		metrics.StatsHealthyGauge.WithLabelValues("[0,50)"),           // 0
+		metrics.StatsHealthyGauge.WithLabelValues("[50,55)"),          // 1
+		metrics.StatsHealthyGauge.WithLabelValues("[55,60)"),          // 2
+		metrics.StatsHealthyGauge.WithLabelValues("[60,70)"),          // 3
+		metrics.StatsHealthyGauge.WithLabelValues("[70,80)"),          // 4
+		metrics.StatsHealthyGauge.WithLabelValues("[80,100)"),         // 5
+		metrics.StatsHealthyGauge.WithLabelValues("[100,100]"),        // 6
+		metrics.StatsHealthyGauge.WithLabelValues("[0,100]"),          // 7
+		metrics.StatsHealthyGauge.WithLabelValues("unneeded analyze"), // 8
 	}
 
 	DumpHistoricalStatsSuccessCounter = metrics.HistoricalStatsCounter.WithLabelValues("dump", "success")