Reduce exposed metrics

Dockerfile

@@ -1,5 +1,4 @@
-FROM        quay.io/prometheus/busybox:latest
-MAINTAINER  Daniel Qian <qsj.daniel@gmail.com>
+FROM        debian:slim
 
 COPY kafka_exporter /bin/kafka_exporter
 

go.mod

@@ -4,29 +4,36 @@ go 1.12
 
 require (
 	github.com/Shopify/sarama v1.27.0
-	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc
-	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751
+	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d
 	github.com/beorn7/perks v1.0.1
 	github.com/davecgh/go-spew v1.1.1
 	github.com/eapache/go-resiliency v1.2.0
 	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21
 	github.com/eapache/queue v1.1.0
 	github.com/golang/protobuf v1.4.2
 	github.com/golang/snappy v0.0.1
+	github.com/google/go-github/v25 v25.1.3 // indirect
+	github.com/imduffy15/kafka_exporter v1.2.0 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.3
 	github.com/krallistic/kazoo-go v0.0.0-20170526135507-a15279744f4e
 	github.com/matttproud/golang_protobuf_extensions v1.0.1
 	github.com/pierrec/lz4 v2.5.2+incompatible
 	github.com/pkg/profile v1.2.1 // indirect
-	github.com/prometheus/client_golang v0.9.4
-	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
-	github.com/prometheus/common v0.4.1
+	github.com/prometheus/client_golang v1.7.1
+	github.com/prometheus/client_model v0.2.0
+	github.com/prometheus/common v0.13.0
 	github.com/prometheus/procfs v0.1.3
+	github.com/prometheus/promu v0.5.0 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0
-	github.com/samuel/go-zookeeper v0.0.0-20180130194729-c4fab1ac1bec
+	github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da
 	github.com/sirupsen/logrus v1.6.0
 	github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c
-	golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37
-	golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/net v0.0.0-20200822124328-c89045814202 // indirect
+	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d // indirect
+	golang.org/x/sys v0.0.0-20200826173525-f9321e4c35a6
+	google.golang.org/appengine v1.6.6 // indirect
+	google.golang.org/protobuf v1.25.0 // indirect
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 )