fix: delete unused var and const (#3294)

Signed-off-by: hwdef <hwdef97@gmail.com>

coremain/run.go

@@ -184,7 +184,6 @@ func setVersion() {
 // Flags that control program flow or startup
 var (
 	conf    string
-	logfile bool
 	version bool
 	plugins bool
 )

plugin/dnssec/handler.go

@@ -55,13 +55,6 @@ var (
 		Help:      "The number of elements in the dnssec cache.",
 	}, []string{"server", "type"})
 
-	cacheCapacity = prometheus.NewGaugeVec(prometheus.GaugeOpts{
-		Namespace: plugin.Namespace,
-		Subsystem: "dnssec",
-		Name:      "cache_capacity",
-		Help:      "The dnssec cache's capacity.",
-	}, []string{"server", "type"})
-
 	cacheHits = prometheus.NewCounterVec(prometheus.CounterOpts{
 		Namespace: plugin.Namespace,
 		Subsystem: "dnssec",

plugin/dnstap/dnstapio/dnstap_encoder.go

@@ -11,7 +11,6 @@ import (
 )
 
 const (
-	frameLenSize = 4
 	protobufSize = 1024 * 1024
 )
 

plugin/forward/forward.go

@@ -199,15 +199,6 @@ var (
 	ErrCachedClosed = errors.New("cached connection was closed by peer")
 )
 
-// policy tells forward what policy for selecting upstream it uses.
-type policy int
-
-const (
-	randomPolicy policy = iota
-	roundRobinPolicy
-	sequentialPolicy
-)
-
 // options holds various options that can be set.
 type options struct {
 	forceTCP  bool

plugin/forward/proxy.go

@@ -80,6 +80,5 @@ func (p *Proxy) start(duration time.Duration) {
 
 const (
 	maxTimeout = 2 * time.Second
-	minTimeout = 200 * time.Millisecond
 	hcInterval = 500 * time.Millisecond
 )