diff --git a/Makefile.common b/Makefile.common
index 8e135c554..5547c9bad 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -140,8 +140,9 @@ else
 ifdef GO111MODULE
 	@echo ">> running check for unused/missing packages in go.mod"
 	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
+ifeq (,$(wildcard vendor))
 	@git diff --exit-code -- go.sum go.mod
-ifneq (,$(wildcard vendor))
+else
 	@echo ">> running check for unused packages in vendor/"
 	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
 	@git diff --exit-code -- go.sum go.mod vendor/
diff --git a/cmd/prometheus/main.go b/cmd/prometheus/main.go
index a7b593f11..a10744db9 100644
--- a/cmd/prometheus/main.go
+++ b/cmd/prometheus/main.go
@@ -34,6 +34,7 @@ import (
 
 	"github.com/go-kit/kit/log"
 	"github.com/go-kit/kit/log/level"
+	"github.com/golang/glog"
 	"github.com/oklog/oklog/pkg/group"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
@@ -41,7 +42,6 @@ import (
 	"github.com/prometheus/common/version"
 	prom_runtime "github.com/prometheus/prometheus/pkg/runtime"
 	"gopkg.in/alecthomas/kingpin.v2"
-	k8s_runtime "k8s.io/apimachinery/pkg/util/runtime"
 
 	"github.com/mwitkow/go-conntrack"
 	"github.com/prometheus/common/promlog"
@@ -236,14 +236,9 @@ func main() {
 
 	logger := promlog.New(&cfg.promlogConfig)
 
-	// XXX(fabxc): Kubernetes does background logging which we can only customize by modifying
-	// a global variable.
-	// Ultimately, here is the best place to set it.
-	k8s_runtime.ErrorHandlers = []func(error){
-		func(err error) {
-			level.Error(log.With(logger, "component", "k8s_client_runtime")).Log("err", err)
-		},
-	}
+	// Above level 6, the k8s client would log bearer tokens in clear-text.
+	glog.ClampLevel(6)
+	glog.SetLogger(log.With(logger, "component", "k8s_client_runtime"))
 
 	level.Info(logger).Log("msg", "Starting Prometheus", "version", version.Info())
 	level.Info(logger).Log("build_context", version.BuildContext())
diff --git a/discovery/kubernetes/client_metrics.go b/discovery/kubernetes/client_metrics.go
index 19dc7023e..97b83d004 100644
--- a/discovery/kubernetes/client_metrics.go
+++ b/discovery/kubernetes/client_metrics.go
@@ -163,6 +163,13 @@ var (
 	)
 )
 
+// gaugeSetFunc is an adapter that allows the use of functions as gauge metric setters.
+type gaugeSetFunc func(float64)
+
+func (s gaugeSetFunc) Set(value float64) {
+	s(value)
+}
+
 // Definition of dummy metric used as a placeholder if we don't want to observe some data.
 type noopMetric struct{}
 
@@ -262,7 +269,11 @@ func (f *clientGoWorkqueueMetricsProvider) NewUnfinishedWorkSecondsMetric(name s
 	return clientGoWorkqueueUnfinishedWorkSecondsMetricVec.WithLabelValues(name)
 }
 func (f *clientGoWorkqueueMetricsProvider) NewLongestRunningProcessorMicrosecondsMetric(name string) workqueue.SettableGaugeMetric {
-	return clientGoWorkqueueLongestRunningProcessorMetricVec.WithLabelValues(name)
+	metric := clientGoWorkqueueLongestRunningProcessorMetricVec.WithLabelValues(name)
+	return gaugeSetFunc(func(v float64) {
+		metric.Set(v / 1e6)
+	})
+
 }
 func (clientGoWorkqueueMetricsProvider) NewRetriesMetric(name string) workqueue.CounterMetric {
 	// Retries are not used so the metric is omitted.
diff --git a/go.mod b/go.mod
index f8b26ac08..2d6160b23 100644
--- a/go.mod
+++ b/go.mod
@@ -40,6 +40,7 @@ require (
 	github.com/go-sql-driver/mysql v1.4.0 // indirect
 	github.com/go-stack/stack v1.5.4 // indirect
 	github.com/gogo/protobuf v0.0.0-20171123125729-971cbfd2e72b
+	github.com/golang/glog v0.0.0-20141105023935-44145f04b68c
 	github.com/golang/groupcache v0.0.0-20180924190550-6f2cf27854a4 // indirect
 	github.com/golang/protobuf v0.0.0-20180622174009-9eb2c01ac278 // indirect
 	github.com/golang/snappy v0.0.0-20160529050041-d9eb7a3d35ec
@@ -150,3 +151,5 @@ require (
 	launchpad.net/gocheck v0.0.0-20140225173054-000000000087 // indirect
 	sigs.k8s.io/yaml v1.1.0 // indirect
 )
+
+replace github.com/golang/glog => github.com/kubermatic/glog-gokit v0.0.0-20181129151237-8ab7e4c2d352
diff --git a/go.sum b/go.sum
index e228153f9..a573c8361 100644
--- a/go.sum
+++ b/go.sum
@@ -151,6 +151,8 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kubermatic/glog-gokit v0.0.0-20181129151237-8ab7e4c2d352 h1:IwAUUBomA7q2TedTHQ3ebjwXVp8aHwi453m7AFn0vCk=
+github.com/kubermatic/glog-gokit v0.0.0-20181129151237-8ab7e4c2d352/go.mod h1:WUD00rCUd6ntFOOuzJbT/MRrM+6X0Zufa6wWYBcf4zY=
 github.com/lib/pq v1.0.0 h1:X5PMW56eZitiTeO7tKzZxFCSpbFZJtkMMooicw2us9A=
 github.com/lib/pq v1.0.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lightstep/lightstep-tracer-go v0.15.6 h1:D0GGa7afJ7GcQvu5as6ssLEEKYXvRgKI5d5cevtz8r4=
diff --git a/vendor/github.com/golang/glog/LICENSE b/vendor/github.com/golang/glog/LICENSE
new file mode 100644
index 000000000..b3dcbe455
--- /dev/null
+++ b/vendor/github.com/golang/glog/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Kubermatic
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/golang/glog/README.md b/vendor/github.com/golang/glog/README.md
new file mode 100644
index 000000000..e3c5d4311
--- /dev/null
+++ b/vendor/github.com/golang/glog/README.md
@@ -0,0 +1,65 @@
+# glog-gokit
+
+This packages is a replacement for [glog](github.com/golang/glog)
+in projects that use the [go-kit logger](https://godoc.org/github.com/go-kit/kit/log).
+
+It is inspired by istio's glog package for zap:
+https://github.com/istio/glog
+
+## Usage
+
+Override the official glog package with this one.
+This simply replaces the code in `vendor/golang/glog` with the code of this package.
+
+In your `Gopkg.toml`:
+```toml
+[[override]]
+  name = "github.com/golang/glog"
+  source = "github.com/kubermatic/glog-gokit"
+```
+
+In your `main.go`:
+```go
+// Import the package like it is original glog
+import "github.com/golang/glog"
+
+
+// Create go-kit logger in your main.go
+logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stdout))
+logger = log.With(logger, "ts", log.DefaultTimestampUTC)
+logger = log.With(logger, "caller", log.DefaultCaller)
+logger = level.NewFilter(logger, level.AllowAll())
+
+// Overriding the default glog with our go-kit glog implementation.
+// Thus we need to pass it our go-kit logger object.
+glog.SetLogger(logger)
+```
+
+Setting the logger to the glog package **MUST** happen before using glog in any package.
+
+## Function Levels
+
+|     glog     | gokit |
+| ------------ | ----- |
+| Info         | Debug |
+| InfoDepth    | Debug |
+| Infof        | Debug |
+| Infoln       | Debug |
+| Warning      | Warn  |
+| WarningDepth | Warn  |
+| Warningf     | Warn  |
+| Warningln    | Warn  |
+| Error        | Error |
+| ErrorDepth   | Error |
+| Errorf       | Error |
+| Errorln      | Error |
+| Exit         | Error |
+| ExitDepth    | Error |
+| Exitf        | Error |
+| Exitln       | Error |
+| Fatal        | Error |
+| FatalDepth   | Error |
+| Fatalf       | Error |
+| Fatalln      | Error |
+
+This table is rather opinionated and build for use with the Kubernetes' [Go client](https://github.com/kubernetes/client-go).
diff --git a/vendor/github.com/golang/glog/glog.go b/vendor/github.com/golang/glog/glog.go
new file mode 100644
index 000000000..d4ad3c497
--- /dev/null
+++ b/vendor/github.com/golang/glog/glog.go
@@ -0,0 +1,143 @@
+package glog
+
+import (
+	"fmt"
+	"math"
+	"os"
+	"sync"
+
+	"github.com/go-kit/kit/log"
+	"github.com/go-kit/kit/log/level"
+)
+
+var maxLevel Level = math.MaxInt32
+var logger = log.NewNopLogger()
+var mu = sync.Mutex{}
+
+// SetLogger redirects glog logging to the given logger.
+// It must be called prior any call to glog.
+func SetLogger(l log.Logger) {
+	mu.Lock()
+	logger = l
+	mu.Unlock()
+}
+
+// ClampLevel clamps the leveled logging at the specified value.
+// It must be called prior any call to glog.
+func ClampLevel(l Level) {
+	mu.Lock()
+	maxLevel = l
+	mu.Unlock()
+}
+
+type Level int32
+
+type Verbose bool
+
+func V(level Level) Verbose { return level <= maxLevel }
+
+func (v Verbose) Info(args ...interface{}) {
+	if v {
+		level.Debug(logger).Log("func", "Verbose.Info", "msg", fmt.Sprint(args...))
+	}
+}
+
+func (v Verbose) Infoln(args ...interface{}) {
+	if v {
+		level.Debug(logger).Log("func", "Verbose.Infoln", "msg", fmt.Sprint(args...))
+	}
+}
+
+func (v Verbose) Infof(format string, args ...interface{}) {
+	if v {
+		level.Debug(logger).Log("func", "Verbose.Infof", "msg", fmt.Sprintf(format, args...))
+	}
+}
+
+func Info(args ...interface{}) {
+	level.Debug(logger).Log("func", "Info", "msg", fmt.Sprint(args...))
+}
+
+func InfoDepth(depth int, args ...interface{}) {
+	level.Debug(logger).Log("func", "InfoDepth", "msg", fmt.Sprint(args...))
+}
+
+func Infoln(args ...interface{}) {
+	level.Debug(logger).Log("func", "Infoln", "msg", fmt.Sprint(args...))
+}
+
+func Infof(format string, args ...interface{}) {
+	level.Debug(logger).Log("func", "Infof", "msg", fmt.Sprintf(format, args...))
+}
+
+func Warning(args ...interface{}) {
+	level.Warn(logger).Log("func", "Warning", "msg", fmt.Sprint(args...))
+}
+
+func WarningDepth(depth int, args ...interface{}) {
+	level.Warn(logger).Log("func", "WarningDepth", "msg", fmt.Sprint(args...))
+}
+
+func Warningln(args ...interface{}) {
+	level.Warn(logger).Log("func", "Warningln", "msg", fmt.Sprint(args...))
+}
+
+func Warningf(format string, args ...interface{}) {
+	level.Warn(logger).Log("func", "Warningf", "msg", fmt.Sprintf(format, args...))
+}
+
+func Error(args ...interface{}) {
+	level.Error(logger).Log("func", "Error", "msg", fmt.Sprint(args...))
+}
+
+func ErrorDepth(depth int, args ...interface{}) {
+	level.Error(logger).Log("func", "ErrorDepth", "msg", fmt.Sprint(args...))
+}
+
+func Errorln(args ...interface{}) {
+	level.Error(logger).Log("func", "Errorln", "msg", fmt.Sprint(args...))
+}
+
+func Errorf(format string, args ...interface{}) {
+	level.Error(logger).Log("func", "Errorf", "msg", fmt.Sprintf(format, args...))
+}
+
+func Fatal(args ...interface{}) {
+	level.Error(logger).Log("func", "Fatal", "msg", fmt.Sprint(args...))
+	os.Exit(255)
+}
+
+func FatalDepth(depth int, args ...interface{}) {
+	level.Error(logger).Log("func", "FatalDepth", "msg", fmt.Sprint(args...))
+	os.Exit(255)
+}
+
+func Fatalln(args ...interface{}) {
+	level.Error(logger).Log("func", "Fatalln", "msg", fmt.Sprint(args...))
+	os.Exit(255)
+}
+
+func Fatalf(format string, args ...interface{}) {
+	level.Error(logger).Log("func", "Fatalf", "msg", fmt.Sprintf(format, args...))
+	os.Exit(255)
+}
+
+func Exit(args ...interface{}) {
+	level.Error(logger).Log("func", "Exit", "msg", fmt.Sprint(args...))
+	os.Exit(1)
+}
+
+func ExitDepth(depth int, args ...interface{}) {
+	level.Error(logger).Log("func", "ExitDepth", "msg", fmt.Sprint(args...))
+	os.Exit(1)
+}
+
+func Exitln(args ...interface{}) {
+	level.Error(logger).Log("func", "Exitln", "msg", fmt.Sprint(args...))
+	os.Exit(1)
+}
+
+func Exitf(format string, args ...interface{}) {
+	level.Error(logger).Log("func", "Exitf", "msg", fmt.Sprintf(format, args...))
+	os.Exit(1)
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index bbb4cb86b..98d29f51c 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -71,6 +71,8 @@ github.com/gogo/protobuf/proto
 github.com/gogo/protobuf/types
 github.com/gogo/protobuf/sortkeys
 github.com/gogo/protobuf/jsonpb
+# github.com/golang/glog v0.0.0-20141105023935-44145f04b68c => github.com/kubermatic/glog-gokit v0.0.0-20181129151237-8ab7e4c2d352
+github.com/golang/glog
 # github.com/golang/protobuf v0.0.0-20180622174009-9eb2c01ac278
 github.com/golang/protobuf/proto
 github.com/golang/protobuf/jsonpb
@@ -321,7 +323,6 @@ k8s.io/api/storage/v1
 k8s.io/api/storage/v1alpha1
 k8s.io/api/storage/v1beta1
 # k8s.io/apimachinery v0.0.0-20181127025237-2b1284ed4c93
-k8s.io/apimachinery/pkg/util/runtime
 k8s.io/apimachinery/pkg/apis/meta/v1
 k8s.io/apimachinery/pkg/runtime
 k8s.io/apimachinery/pkg/watch
@@ -333,6 +334,7 @@ k8s.io/apimachinery/pkg/conversion
 k8s.io/apimachinery/pkg/fields
 k8s.io/apimachinery/pkg/labels
 k8s.io/apimachinery/pkg/selection
+k8s.io/apimachinery/pkg/util/runtime
 k8s.io/apimachinery/pkg/conversion/queryparams
 k8s.io/apimachinery/pkg/util/errors
 k8s.io/apimachinery/pkg/util/json