1 files changed, 30 insertions, 0 deletions
diff --git a/plugin/grpc/metrics.go b/plugin/grpc/metrics.go
new file mode 100644
index 000000000..76b186bee
--- /dev/null
+++ b/plugin/grpc/metrics.go
@@ -0,0 +1,30 @@
+package grpc
+
+import (
+	"github.com/coredns/coredns/plugin"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Variables declared for monitoring.
+var (
+	RequestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "grpc",
+		Name:      "request_count_total",
+		Help:      "Counter of requests made per upstream.",
+	}, []string{"to"})
+	RcodeCount = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "grpc",
+		Name:      "response_rcode_count_total",
+		Help:      "Counter of requests made per upstream.",
+	}, []string{"rcode", "to"})
+	RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "grpc",
+		Name:      "request_duration_seconds",
+		Buckets:   plugin.TimeBuckets,
+		Help:      "Histogram of the time each request took.",
+	}, []string{"to"})
+)