From f823825f8a34edb85d5d18cd5d2f6f850adf408e Mon Sep 17 00:00:00 2001
From: Pat Downey <patdowney@users.noreply.github.com>
Date: Fri, 24 Mar 2023 12:55:51 +0000
Subject: plugin/forward: Allow Proxy to be used outside of forward plugin.
 (#5951)

* plugin/forward: Move Proxy into pkg/plugin/proxy, to allow forward.Proxy to be used outside of forward plugin.

Signed-off-by: Patrick Downey <patrick.downey@dioadconsulting.com>
---
 plugin/pkg/proxy/metrics.go | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 plugin/pkg/proxy/metrics.go

(limited to 'plugin/pkg/proxy/metrics.go')

diff --git a/plugin/pkg/proxy/metrics.go b/plugin/pkg/proxy/metrics.go
new file mode 100644
index 000000000..148bc6edd
--- /dev/null
+++ b/plugin/pkg/proxy/metrics.go
@@ -0,0 +1,49 @@
+package proxy
+
+import (
+	"github.com/coredns/coredns/plugin"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+// Variables declared for monitoring.
+var (
+	RequestCount = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "requests_total",
+		Help:      "Counter of requests made per upstream.",
+	}, []string{"to"})
+	RcodeCount = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "responses_total",
+		Help:      "Counter of responses received per upstream.",
+	}, []string{"rcode", "to"})
+	RequestDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "request_duration_seconds",
+		Buckets:   plugin.TimeBuckets,
+		Help:      "Histogram of the time each request took.",
+	}, []string{"to", "rcode"})
+	HealthcheckFailureCount = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "healthcheck_failures_total",
+		Help:      "Counter of the number of failed healthchecks.",
+	}, []string{"to"})
+	ConnCacheHitsCount = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "conn_cache_hits_total",
+		Help:      "Counter of connection cache hits per upstream and protocol.",
+	}, []string{"to", "proto"})
+	ConnCacheMissesCount = promauto.NewCounterVec(prometheus.CounterOpts{
+		Namespace: plugin.Namespace,
+		Subsystem: "proxy",
+		Name:      "conn_cache_misses_total",
+		Help:      "Counter of connection cache misses per upstream and protocol.",
+	}, []string{"to", "proto"})
+)
-- 
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