update add bind view cachestats

Signed-off-by: maxiaoyu <[email protected]>

Author: maxiaoyu

Diff for: bind/bind.go

@@ -61,6 +61,7 @@ type Server struct {
 type View struct {
 	Name            string
 	Cache           []Gauge
+	CacheStats      []Counter
 	ResolverStats   []Counter
 	ResolverQueries []Counter
 }

Diff for: bind/json/json.go

@@ -47,9 +47,10 @@ type Statistics struct {
 	ZoneStats  Counters  `json:"zonestats"`
 	Views      map[string]struct {
 		Resolver struct {
-			Cache  Gauges   `json:"cache"`
-			Qtypes Counters `json:"qtypes"`
-			Stats  Counters `json:"stats"`
+			Cache      Gauges   `json:"cache"`
+			Qtypes     Counters `json:"qtypes"`
+			Stats      Counters `json:"stats"`
+			CacheStats Counters `json:"cachestats"`
 		} `json:"resolver"`
 	} `json:"views"`
 }
@@ -156,6 +157,9 @@ func (c *Client) Stats(groups ...bind.StatisticGroup) (bind.Statistics, error) {
 			for k, val := range view.Resolver.Stats {
 				v.ResolverStats = append(v.ResolverStats, bind.Counter{Name: k, Counter: val})
 			}
+			for k, val := range view.Resolver.CacheStats {
+				v.CacheStats = append(v.CacheStats, bind.Counter{Name: k, Counter: val})
+			}
 			s.Views = append(s.Views, v)
 		}
 	}

Diff for: bind_exporter.go

@@ -77,6 +77,11 @@ var (
 		"Number of RRSets in Cache database.",
 		[]string{"view", "type"}, nil,
 	)
+	resolverCacheStats = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, resolver, "cache_stats"),
+		"Number of Cache Stats in Cache database.",
+		[]string{"view", "stat"}, nil,
+	)
 	resolverQueries = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, resolver, "queries_total"),
 		"Number of outgoing DNS queries.",
@@ -323,6 +328,11 @@ func (c *viewCollector) Collect(ch chan<- prometheus.Metric) {
 				resolverCache, prometheus.GaugeValue, float64(s.Gauge), v.Name, s.Name,
 			)
 		}
+		for _, s := range v.CacheStats {
+			ch <- prometheus.MustNewConstMetric(
+				resolverCacheStats, prometheus.GaugeValue, float64(s.Counter), v.Name, s.Name,
+			)
+		}
 		for _, s := range v.ResolverQueries {
 			ch <- prometheus.MustNewConstMetric(
 				resolverQueries, prometheus.CounterValue, float64(s.Counter), v.Name, s.Name,