Remove the word middleware (#1067)

* Rename middleware to plugin

first pass; mostly used 'sed', few spots where I manually changed
text.

This still builds a coredns binary.

* fmt error

* Rename AddMiddleware to AddPlugin

* Readd AddMiddleware to remain backwards compat

1 files changed, 0 insertions, 69 deletions

diff --git a/middleware/metrics/vars/vars.go b/middleware/metrics/vars/vars.go
deleted file mode 100644
index 42af10007..000000000
--- a/middleware/metrics/vars/vars.go
+++ /dev/null
@@ -1,69 +0,0 @@
-package vars
-
-import (
-	"github.com/coredns/coredns/middleware"
-
-	"github.com/prometheus/client_golang/prometheus"
-)
-
-// Request* and Response* are the prometheus counters and gauges we are using for exporting metrics.
-var (
-	RequestCount = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "request_count_total",
-		Help:      "Counter of DNS requests made per zone, protocol and family.",
-	}, []string{"zone", "proto", "family"})
-
-	RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "request_duration_milliseconds",
-		Buckets:   append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
-		Help:      "Histogram of the time (in milliseconds) each request took.",
-	}, []string{"zone"})
-
-	RequestSize = prometheus.NewHistogramVec(prometheus.HistogramOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "request_size_bytes",
-		Help:      "Size of the EDNS0 UDP buffer in bytes (64K for TCP).",
-		Buckets:   []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
-	}, []string{"zone", "proto"})
-
-	RequestDo = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "request_do_count_total",
-		Help:      "Counter of DNS requests with DO bit set per zone.",
-	}, []string{"zone"})
-
-	RequestType = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "request_type_count_total",
-		Help:      "Counter of DNS requests per type, per zone.",
-	}, []string{"zone", "type"})
-
-	ResponseSize = prometheus.NewHistogramVec(prometheus.HistogramOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "response_size_bytes",
-		Help:      "Size of the returned response in bytes.",
-		Buckets:   []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
-	}, []string{"zone", "proto"})
-
-	ResponseRcode = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Namespace: middleware.Namespace,
-		Subsystem: subsystem,
-		Name:      "response_rcode_count_total",
-		Help:      "Counter of response status codes.",
-	}, []string{"zone", "rcode"})
-)
-
-const (
-	subsystem = "dns"
-
-	// Dropped indicates we dropped the query before any handling. It has no closing dot, so it can not be a valid zone.
-	Dropped = "dropped"
-)