completed metrics of cache and forward (#3962)

Signed-off-by: zounengren <zounengren@cmss.chinamobile.com>

man/coredns-cache.7

@@ -100,6 +100,8 @@ If monitoring is enabled (via the \fIprometheus\fP plugin) then the following me
 .IP \(bu 4
 \fB\fCcoredns_cache_misses_total{server}\fR - Counter of cache misses.
 .IP \(bu 4
+\fB\fCcoredns_cache_prefetch_total{server}\fR - Counter of cache has prefetched a cached item.
+.IP \(bu 4
 \fB\fCcoredns_cache_drops_total{server}\fR - Counter of responses excluded from the cache due to request/response question name mismatch.
 .IP \(bu 4
 \fB\fCcoredns_cache_served_stale_total{server}\fR - Counter of requests served from stale cache entries.

man/coredns-forward.7

@@ -163,9 +163,11 @@ The read timeout is static at 2s.
 If monitoring is enabled (via the \fIprometheus\fP plugin) then the following metric are exported:
 
 .IP \(bu 4
-\fB\fCcoredns_forward_request_duration_seconds{to}\fR - duration per upstream interaction.
+\fB\fCcoredns_forward_requests_total{to}\fR - Counter of requests made per upstream.
+.IP \(bu 4
+\fB\fCcoredns_forward_responses_total{to}\fR - Counter of responses made per upstream.
 .IP \(bu 4
-\fB\fCcoredns_forward_requests_total{to}\fR - query count per upstream.
+\fB\fCcoredns_forward_request_duration_seconds{to}\fR - duration per upstream interaction.
 .IP \(bu 4
 \fB\fCcoredns_forward_responses_total{to, rcode}\fR - count of RCODEs per upstream.
 .IP \(bu 4

plugin/cache/README.md

@@ -73,6 +73,7 @@ If monitoring is enabled (via the *prometheus* plugin) then the following metric
 * `coredns_cache_entries{server, type}` - Total elements in the cache by cache type.
 * `coredns_cache_hits_total{server, type}` - Counter of cache hits by cache type.
 * `coredns_cache_misses_total{server}` - Counter of cache misses.
+* `coredns_cache_prefetch_total{server}` - Counter of cache has prefetched a cached item.
 * `coredns_cache_drops_total{server}` - Counter of responses excluded from the cache due to request/response question name mismatch.
 * `coredns_cache_served_stale_total{server}` - Counter of requests served from stale cache entries.
 

plugin/forward/README.md

@@ -107,8 +107,9 @@ On each endpoint, the timeouts for communication are set as follows:
 
 If monitoring is enabled (via the *prometheus* plugin) then the following metric are exported:
 
-* `coredns_forward_request_duration_seconds{to}` - duration per upstream interaction.
 * `coredns_forward_requests_total{to}` - query count per upstream.
+* `coredns_forward_responses_total{to}` - Counter of responses made per upstream.
+* `coredns_forward_request_duration_seconds{to}` - duration per upstream interaction.
 * `coredns_forward_responses_total{to, rcode}` - count of RCODEs per upstream.
 * `coredns_forward_healthcheck_failures_total{to}` - number of failed health checks per upstream.
 * `coredns_forward_healthcheck_broken_total{}` - counter of when all upstreams are unhealthy,

plugin/forward/metrics.go

@@ -18,7 +18,7 @@ var (
 		Namespace: plugin.Namespace,
 		Subsystem: "forward",
 		Name:      "responses_total",
-		Help:      "Counter of requests made per upstream.",
+		Help:      "Counter of response made per upstream.",
 	}, []string{"rcode", "to"})
 	RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
 		Namespace: plugin.Namespace,