Update metric names (#371)

Cleanup names/typos to match standard naming conventions.

middleware/cache/README.md

@@ -39,8 +39,8 @@ The minimum TTL allowed on resource records is 5 seconds.
 
 If monitoring is enabled (via the *prometheus* directive) then the following metrics are exported:
 
-* coredns_cache_size_guage{type} - total elements in the case, type is either "denial" or "success".
-* coredns_cache_capacity_guage{type} - total capacity of the cache, type is either "denial" or "success".
+* coredns_cache_size{type} - total elements in the case, type is either "denial" or "success".
+* coredns_cache_capacity{type} - total capacity of the cache, type is either "denial" or "success".
 
 ## Examples
 

middleware/cache/handler.go

@@ -57,15 +57,15 @@ var (
 	cacheSize = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: middleware.Namespace,
 		Subsystem: subsystem,
-		Name:      "size_guage",
-		Help:      "Gauge of number of elements in the cache.",
+		Name:      "size",
+		Help:      "The number of elements in the cache.",
 	}, []string{"type"})
 
 	cacheCapacity = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: middleware.Namespace,
 		Subsystem: subsystem,
-		Name:      "capacity_gauge",
-		Help:      "Gauge of cache's capacity.",
+		Name:      "capacity",
+		Help:      "The cache's capacity.",
 	}, []string{"type"})
 )
 

middleware/dnssec/README.md

@@ -41,7 +41,7 @@ dnssec [ZONES... ] {
 
 If monitoring is enabled (via the *prometheus* directive) then the following metrics are exported:
 
-* coredns_dnssec_size_guage{type} - total elements in the cache, type is "signature".
-* coredns_dnssec_capacity_guage{type} - total capacity of the cache, type is "signature".
+* coredns_dnssec_cache_size{type} - total elements in the cache, type is "signature".
+* coredns_dnssec_cache_capacity{type} - total capacity of the cache, type is "signature".
 
 ## Examples

middleware/dnssec/handler.go

@@ -43,15 +43,15 @@ var (
 	cacheSize = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: middleware.Namespace,
 		Subsystem: subsystem,
-		Name:      "size_guage",
-		Help:      "Gauge of number of elements in the cache.",
+		Name:      "cache_size",
+		Help:      "The number of elements in the dnssec cache.",
 	}, []string{"type"})
 
 	cacheCapacity = prometheus.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: middleware.Namespace,
 		Subsystem: subsystem,
-		Name:      "capacity_gauge",
-		Help:      "Gauge of cache's capacity.",
+		Name:      "cache_capacity",
+		Help:      "The dnssec cache's capacity.",
 	}, []string{"type"})
 )
 

middleware/metrics/test/scrape.go

@@ -18,7 +18,7 @@
 // Basic usage:
 //
 //	result := Scrape("http://localhost:9153/metrics")
-//	v := MetricValue("coredns_cache_capacity_gauge", result)
+//	v := MetricValue("coredns_cache_capacity", result)
 //
 package test