cmd/coordinator: migrate to OpenCensus for metrics

Replace low-level Stackdriver monitoring API usage for OpenCensus
with a Stackdriver exporter. To benefit local development, expose
metrics at an /metrics endpoint (to be picked up with Prometheus).

This makes it much easier to add new metrics, to test them locally,
and brings our metrics solution in sync with what's currently in
use in x/playground (see CL 302769). It's expected to be preferable
to migrate to OpenTelemetry in the future when a good migration path
becomes available, and both x/build and x/playground can be updated
at that time.

This CL is based on work in CL 229679 and CL 138522.

For golang/go#26779.
For golang/go#44406.
For golang/go#17104.

Co-authored-by: Alexander Rakoczy <alex@golang.org>
Co-authored-by: Emmanuel T Odeke <emmanuel@orijtech.com>
Change-Id: Iad45730feace471db1668e828b7c9775377be8a9
Reviewed-on: https://go-review.googlesource.com/c/build/+/303669
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
diff --git a/cmd/coordinator/Dockerfile b/cmd/coordinator/Dockerfile
index ce4adc4..76dd27c 100644
--- a/cmd/coordinator/Dockerfile
+++ b/cmd/coordinator/Dockerfile
@@ -22,7 +22,6 @@
     cloud.google.com/go/compute/metadata \
     cloud.google.com/go/datastore \
     cloud.google.com/go/errorreporting \
-    cloud.google.com/go/monitoring/apiv3 \
     cloud.google.com/go/storage \
     github.com/gliderlabs/ssh \
     github.com/golang/protobuf/ptypes \
diff --git a/cmd/coordinator/coordinator.go b/cmd/coordinator/coordinator.go
index 502c870..6ec6dfa 100644
--- a/cmd/coordinator/coordinator.go
+++ b/cmd/coordinator/coordinator.go
@@ -57,6 +57,7 @@
 	"golang.org/x/build/autocertcache"
 	"golang.org/x/build/buildenv"
 	"golang.org/x/build/buildlet"
+	"golang.org/x/build/cmd/coordinator/internal/metrics"
 	"golang.org/x/build/dashboard"
 	"golang.org/x/build/gerrit"
 	"golang.org/x/build/internal/buildgo"
@@ -317,6 +318,17 @@
 
 	addHealthCheckers(context.Background())
 
+	gr, err := metrics.GCEResource("go-build-coordinator")
+	if err != nil && metadata.OnGCE() {
+		log.Println("metrics.GCEResource:", err)
+	}
+	if ms, err := metrics.NewService(gr, views); err != nil {
+		log.Println("failed to initialize metrics:", err)
+	} else {
+		http.Handle("/metrics", ms)
+		defer ms.Stop()
+	}
+
 	cc, err := grpc4.NewClient(http.DefaultClient, "https://maintner.golang.org")
 	if err != nil {
 		log.Fatal(err)
@@ -374,7 +386,7 @@
 		go listenAndServeInternalModuleProxy()
 		go findWorkLoop()
 		go findTryWorkLoop()
-		go reportMetrics(context.Background())
+		go reportReverseCountMetrics()
 		// TODO(cmang): gccgo will need its own findWorkLoop
 	}
 
diff --git a/cmd/coordinator/internal/metrics/README.md b/cmd/coordinator/internal/metrics/README.md
new file mode 100644
index 0000000..83b6707
--- /dev/null
+++ b/cmd/coordinator/internal/metrics/README.md
@@ -0,0 +1,7 @@
+<!-- Auto-generated by x/build/update-readmes.go -->
+
+[![Go Reference](https://pkg.go.dev/badge/golang.org/x/build/cmd/coordinator/internal/metrics.svg)](https://pkg.go.dev/golang.org/x/build/cmd/coordinator/internal/metrics)
+
+# golang.org/x/build/cmd/coordinator/internal/metrics
+
+Package metrics provides a service for reporting metrics to Stackdriver, or locally during development.
diff --git a/cmd/coordinator/internal/metrics/metrics.go b/cmd/coordinator/internal/metrics/metrics.go
new file mode 100644
index 0000000..228971d
--- /dev/null
+++ b/cmd/coordinator/internal/metrics/metrics.go
@@ -0,0 +1,160 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package metrics provides a service for reporting metrics to
+// Stackdriver, or locally during development.
+package metrics
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"path"
+	"time"
+
+	"cloud.google.com/go/compute/metadata"
+	"contrib.go.opencensus.io/exporter/prometheus"
+	"contrib.go.opencensus.io/exporter/stackdriver"
+	"go.opencensus.io/stats/view"
+	mrpb "google.golang.org/genproto/googleapis/api/monitoredres"
+)
+
+// NewService initializes a *Service.
+//
+// The Service returned is configured to send metric data to
+// StackDriver. When not running on GCE, it will host metrics through
+// a prometheus HTTP handler.
+//
+// views will be passed to view.Register for export to the metric
+// service.
+func NewService(resource *MonitoredResource, views []*view.View) (*Service, error) {
+	err := view.Register(views...)
+	if err != nil {
+		return nil, err
+	}
+
+	if !metadata.OnGCE() {
+		view.SetReportingPeriod(5 * time.Second)
+		pe, err := prometheus.NewExporter(prometheus.Options{})
+		if err != nil {
+			return nil, fmt.Errorf("prometheus.NewExporter: %w", err)
+		}
+		view.RegisterExporter(pe)
+		return &Service{pExporter: pe}, nil
+	}
+
+	projID, err := metadata.ProjectID()
+	if err != nil {
+		return nil, err
+	}
+	if resource == nil {
+		return nil, errors.New("resource is required, got nil")
+	}
+	sde, err := stackdriver.NewExporter(stackdriver.Options{
+		ProjectID:         projID,
+		MonitoredResource: resource,
+		ReportingInterval: time.Minute, // Minimum interval for Stackdriver is 1 minute.
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Minimum interval for Stackdriver is 1 minute.
+	view.SetReportingPeriod(time.Minute)
+	// Start the metrics exporter.
+	if err := sde.StartMetricsExporter(); err != nil {
+		return nil, err
+	}
+
+	return &Service{sdExporter: sde}, nil
+}
+
+// Service controls metric exporters.
+type Service struct {
+	sdExporter *stackdriver.Exporter
+	pExporter  *prometheus.Exporter
+}
+
+func (m *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if m.pExporter != nil {
+		m.pExporter.ServeHTTP(w, r)
+		return
+	}
+	http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+}
+
+// Stop flushes metrics and stops exporting. Stop should be called
+// before exiting.
+func (m *Service) Stop() {
+	if sde := m.sdExporter; sde != nil {
+		// Flush any unsent data before exiting.
+		sde.Flush()
+
+		sde.StopMetricsExporter()
+	}
+}
+
+// MonitoredResource wraps a *mrpb.MonitoredResource to implement the
+// monitoredresource.MonitoredResource interface.
+type MonitoredResource mrpb.MonitoredResource
+
+func (r *MonitoredResource) MonitoredResource() (resType string, labels map[string]string) {
+	return r.Type, r.Labels
+}
+
+// GCEResource populates a MonitoredResource with GCE Metadata.
+//
+// The returned MonitoredResource will have the type set to "generic_task".
+func GCEResource(jobName string) (*MonitoredResource, error) {
+	projID, err := metadata.ProjectID()
+	if err != nil {
+		return nil, err
+	}
+	zone, err := metadata.Zone()
+	if err != nil {
+		return nil, err
+	}
+	inst, err := metadata.InstanceName()
+	if err != nil {
+		return nil, err
+	}
+	group, err := instanceGroupName()
+	if err != nil {
+		return nil, err
+	} else if group == "" {
+		group = projID
+	}
+
+	return (*MonitoredResource)(&mrpb.MonitoredResource{
+		Type: "generic_task", // See: https://cloud.google.com/monitoring/api/resources#tag_generic_task
+		Labels: map[string]string{
+			"project_id": projID,
+			"location":   zone,
+			"namespace":  group,
+			"job":        jobName,
+			"task_id":    inst,
+		},
+	}), nil
+}
+
+// instanceGroupName fetches the instanceGroupName from the instance
+// metadata.
+//
+// The instance group manager applies a custom "created-by" attribute
+// to the instance, which is not part of the metadata package API, and
+// must be queried separately.
+//
+// An empty string will be returned if a metadata.NotDefinedError is
+// returned when fetching metadata. An error will be returned if other
+// errors occur when fetching metadata.
+func instanceGroupName() (string, error) {
+	ig, err := metadata.InstanceAttributeValue("created-by")
+	if errors.As(err, new(metadata.NotDefinedError)) {
+		return "", nil
+	} else if err != nil {
+		return "", err
+	}
+	// "created-by" format: "projects/{{InstanceID}}/zones/{{Zone}}/instanceGroupManagers/{{Instance Group Name}}
+	return path.Base(ig), nil
+}
diff --git a/cmd/coordinator/metrics.go b/cmd/coordinator/metrics.go
index b998537..1df48dc 100644
--- a/cmd/coordinator/metrics.go
+++ b/cmd/coordinator/metrics.go
@@ -10,66 +10,44 @@
 
 import (
 	"context"
-	"log"
 	"time"
 
-	"golang.org/x/build/cmd/coordinator/metrics"
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/tag"
 	"golang.org/x/build/internal/coordinator/pool"
-
-	"github.com/golang/protobuf/ptypes"
-	metpb "google.golang.org/genproto/googleapis/api/metric"
-	monpb "google.golang.org/genproto/googleapis/monitoring/v3"
 )
 
-// reportMetrics gathers and reports buildlet metrics to Stackdriver.
-// It currently only reports count of running reverse buildlets per type.
-func reportMetrics(ctx context.Context) {
+var (
+	kHostType         = tag.MustNewKey("go-build/coordinator/host_type")
+	mReverseBuildlets = stats.Int64("go-build/coordinator/reverse_buildlets_count", "number of reverse buildlets", stats.UnitDimensionless)
+)
+
+// views should contain all measurements. All *view.View added to this
+// slice will be registered and exported to the metric service.
+var views = []*view.View{
+	{
+		Name:        "go-build/coordinator/reverse_buildlets_count",
+		Description: "Number of reverse buildlets that are up",
+		Measure:     mReverseBuildlets,
+		TagKeys:     []tag.Key{kHostType},
+		Aggregation: view.LastValue(),
+	},
+}
+
+// reportReverseCountMetrics gathers and reports
+// a count of running reverse buildlets per type.
+func reportReverseCountMetrics() {
 	for {
-		err := reportReverseCountMetrics(ctx)
-		if err != nil {
-			log.Printf("error reporting %q metrics: %v\n",
-				metrics.ReverseCount.Name, err)
+		// 1. Gather # buildlets up per reverse builder type.
+		totals := pool.ReversePool().HostTypeCount()
+		// 2. Write counts out to the metrics recorder, grouped by hostType.
+		for hostType, n := range totals {
+			stats.RecordWithTags(context.Background(),
+				[]tag.Mutator{tag.Upsert(kHostType, hostType)},
+				mReverseBuildlets.M(int64(n)))
 		}
 
 		time.Sleep(5 * time.Minute)
 	}
-
-}
-
-func reportReverseCountMetrics(ctx context.Context) error {
-	m := metrics.ReverseCount
-	// 1. Gather # buildlets up per reverse builder type
-	totals := pool.ReversePool().HostTypeCount()
-	// 2. Write counts to Stackdriver
-	ts := []*monpb.TimeSeries{}
-	now := ptypes.TimestampNow()
-	for hostType, n := range totals {
-		labels, err := m.Labels(hostType)
-		if err != nil {
-			return err
-		}
-		tv, err := m.TypedValue(n)
-		if err != nil {
-			return err
-		}
-		ts = append(ts, &monpb.TimeSeries{
-			Metric: &metpb.Metric{
-				Type:   m.Descriptor.Type,
-				Labels: labels,
-			},
-			Points: []*monpb.Point{
-				{
-					Interval: &monpb.TimeInterval{
-						EndTime: now,
-					},
-					Value: tv,
-				},
-			},
-		})
-	}
-
-	return pool.NewGCEConfiguration().MetricsClient().CreateTimeSeries(ctx, &monpb.CreateTimeSeriesRequest{
-		Name:       m.DescriptorPath(pool.NewGCEConfiguration().BuildEnv().ProjectName),
-		TimeSeries: ts,
-	})
 }
diff --git a/cmd/coordinator/metrics/README.md b/cmd/coordinator/metrics/README.md
deleted file mode 100644
index de8b49d..0000000
--- a/cmd/coordinator/metrics/README.md
+++ /dev/null
@@ -1,7 +0,0 @@
-<!-- Auto-generated by x/build/update-readmes.go -->
-
-[![Go Reference](https://pkg.go.dev/badge/golang.org/x/build/cmd/coordinator/metrics.svg)](https://pkg.go.dev/golang.org/x/build/cmd/coordinator/metrics)
-
-# golang.org/x/build/cmd/coordinator/metrics
-
-Package metrics enumerates the set of Stackdriver metrics used by the Go build system.
diff --git a/cmd/coordinator/metrics/metrics.go b/cmd/coordinator/metrics/metrics.go
deleted file mode 100644
index 14ed25b..0000000
--- a/cmd/coordinator/metrics/metrics.go
+++ /dev/null
@@ -1,111 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package metrics enumerates the set of Stackdriver metrics
-// used by the Go build system.
-package metrics
-
-import (
-	"errors"
-	"fmt"
-
-	monapi "cloud.google.com/go/monitoring/apiv3"
-	"google.golang.org/genproto/googleapis/api/label"
-	metpb "google.golang.org/genproto/googleapis/api/metric"
-	monpb "google.golang.org/genproto/googleapis/monitoring/v3"
-)
-
-// Metric defines a custom metric type used by Go build system.
-type Metric struct {
-	Name       string
-	Descriptor *metpb.MetricDescriptor
-}
-
-// ReverseCount is the Stackdriver metric for monitoring
-// the number of reverse buildlets up at any given moment.
-var ReverseCount = &Metric{
-	Name: "reverse/count",
-	Descriptor: &metpb.MetricDescriptor{
-		Type: "custom.googleapis.com/reverse/count",
-		Labels: []*label.LabelDescriptor{
-			{
-				Key:       "hosttype",
-				ValueType: label.LabelDescriptor_STRING,
-			},
-		},
-		MetricKind: metpb.MetricDescriptor_GAUGE,
-		ValueType:  metpb.MetricDescriptor_INT64,
-	},
-}
-
-// Metrics is the set of all Stackdriver metrics being used
-// to monitor the Go build system.
-var Metrics = []*Metric{
-	ReverseCount,
-}
-
-// DescriptorPath returns the unique path for this metric among all
-// GCP resources in all projects.
-// See cloud.google.com/monitoring/custom-metrics/creating-metrics
-// for details.
-func (m *Metric) DescriptorPath(project string) string {
-	return monapi.MetricMetricDescriptorPath(project, m.Descriptor.Type)
-}
-
-// Labels populates the set of labels with the given label values.
-// The labels should be passed in the same order as defined in the metric
-// descriptor. All labels listed in the Descriptor must be assigned values.
-func (m *Metric) Labels(labels ...string) (map[string]string, error) {
-	if len(m.Descriptor.Labels) != len(labels) {
-		return nil, errors.New("mismatch metric labels")
-	}
-	lm := make(map[string]string)
-	for i, l := range m.Descriptor.Labels {
-		lm[l.Key] = labels[i]
-	}
-	return lm, nil
-}
-
-// TypedValue returns the cooresponding *monpb.TypedValue based on
-// the metric descriptor's value type.
-func (m *Metric) TypedValue(v interface{}) (*monpb.TypedValue, error) {
-	var tv monpb.TypedValue
-	switch m.Descriptor.ValueType {
-	case metpb.MetricDescriptor_BOOL:
-		if vt, ok := v.(bool); ok {
-			tv.Value = &monpb.TypedValue_BoolValue{
-				BoolValue: vt,
-			}
-		} else {
-			return nil, fmt.Errorf("wrong value type (%T) for BOOL", v)
-		}
-	case metpb.MetricDescriptor_INT64:
-		if vt, ok := v.(int); ok {
-			tv.Value = &monpb.TypedValue_Int64Value{
-				Int64Value: int64(vt),
-			}
-		} else {
-			return nil, fmt.Errorf("wrong value type (%T) for INT64", v)
-		}
-	case metpb.MetricDescriptor_DOUBLE:
-		if vt, ok := v.(float64); ok {
-			tv.Value = &monpb.TypedValue_DoubleValue{
-				DoubleValue: float64(vt),
-			}
-		} else {
-			return nil, fmt.Errorf("wrong value type (%T) for DOUBLE", v)
-		}
-	case metpb.MetricDescriptor_STRING:
-		if vt, ok := v.(string); ok {
-			tv.Value = &monpb.TypedValue_StringValue{
-				StringValue: string(vt),
-			}
-		} else {
-			return nil, fmt.Errorf("wrong value type (%T) for STRING", v)
-		}
-	case metpb.MetricDescriptor_DISTRIBUTION, metpb.MetricDescriptor_MONEY:
-		return nil, errors.New("unused metric descriptor value type")
-	}
-	return &tv, nil
-}
diff --git a/cmd/coordinator/metrics/metrics_test.go b/cmd/coordinator/metrics/metrics_test.go
deleted file mode 100644
index 8b2a56a..0000000
--- a/cmd/coordinator/metrics/metrics_test.go
+++ /dev/null
@@ -1,173 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package metrics_test
-
-import (
-	"errors"
-	"fmt"
-	"strings"
-	"testing"
-
-	"golang.org/x/build/cmd/coordinator/metrics"
-	"google.golang.org/genproto/googleapis/api/label"
-	metpb "google.golang.org/genproto/googleapis/api/metric"
-)
-
-func TestMetricDescriptorPath(t *testing.T) {
-	project := "my-project"
-	m := &metrics.Metric{
-		Name: "parent/child",
-		Descriptor: &metpb.MetricDescriptor{
-			Type: "custom.googleapis.com/parent/child",
-		},
-	}
-
-	got := m.DescriptorPath(project)
-	wantType := "parent/child"
-	wantProject := project
-
-	if !strings.HasSuffix(got, wantType) {
-		t.Fatalf("expected type to be url-encoded.	got: %s,	want: %s", got, wantType)
-	}
-	if !strings.Contains(got, wantProject) {
-		t.Fatalf("expected project encoding not to change.	got: %s	want: %s", got, wantProject)
-	}
-}
-
-func TestMetricLabels(t *testing.T) {
-	m := &metrics.Metric{
-		Name: "parent/child",
-		Descriptor: &metpb.MetricDescriptor{
-			Labels: []*label.LabelDescriptor{
-				{
-					Key:       "label1",
-					ValueType: label.LabelDescriptor_STRING,
-				},
-			},
-		},
-	}
-
-	if _, err := m.Labels("v1"); err != nil {
-		t.Errorf("unexpected error got %v want nil", err)
-	}
-
-	if lm, err := m.Labels("v1", "v2"); err == nil {
-		t.Errorf("expected error got nil, labels populated into %v", lm)
-	}
-}
-
-func TestMetricTypedValue(t *testing.T) {
-	cases := []struct {
-		name string
-		m    *metrics.Metric
-		v    interface{}
-		e    error
-	}{
-		{
-			name: "Wrong BOOL value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_BOOL,
-				},
-			},
-			v: 1,
-			e: fmt.Errorf("wrong value type (int) for BOOL"),
-		},
-		{
-			name: "Correct BOOL value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_BOOL,
-				},
-			},
-			v: true,
-			e: nil,
-		},
-		{
-			name: "Wrong INT64 value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_INT64,
-				},
-			},
-			v: int32(1),
-			e: fmt.Errorf("wrong value type (int32) for INT64"),
-		},
-		{
-			name: "Correct INT64 value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_INT64,
-				},
-			},
-			v: 1,
-			e: nil,
-		},
-		{
-			name: "Wrong DOUBLE value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_DOUBLE,
-				},
-			},
-			v: float32(3.14),
-			e: fmt.Errorf("wrong value type (float32) for DOUBLE"),
-		},
-		{
-			name: "Correct DOUBLE value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_DOUBLE,
-				},
-			},
-			v: 3.14,
-			e: nil,
-		},
-		{
-			name: "Wrong STRING value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_STRING,
-				},
-			},
-			v: false,
-			e: fmt.Errorf("wrong value type (bool) for STRING"),
-		},
-		{
-			name: "Correct STRING value",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_STRING,
-				},
-			},
-			v: "false",
-			e: nil,
-		},
-		{
-			name: "unused type",
-			m: &metrics.Metric{
-				Descriptor: &metpb.MetricDescriptor{
-					ValueType: metpb.MetricDescriptor_DISTRIBUTION,
-				},
-			},
-			v: false,
-			e: errors.New("unused metric descriptor value type"),
-		},
-	}
-
-	for _, tc := range cases {
-		_, err := tc.m.TypedValue(tc.v)
-		if tc.e == nil && err == nil {
-			continue
-		}
-		if tc.e == nil && err != nil {
-			t.Errorf("Test case %s: unexpected error got %v, want nil", tc.name, err)
-		} else if tc.e != nil && err == nil {
-			t.Errorf("Test case %s: expected error got nil, want %v", tc.name, tc.e)
-		} else if err.Error() != tc.e.Error() {
-			t.Errorf("Test case %s: wrong error got %v, want error %v", tc.name, err, tc.e)
-		}
-	}
-}
diff --git a/cmd/gcpinit/gcpinit.go b/cmd/gcpinit/gcpinit.go
index 069e158..dfee59f 100644
--- a/cmd/gcpinit/gcpinit.go
+++ b/cmd/gcpinit/gcpinit.go
@@ -15,18 +15,13 @@
 	"text/template"
 	"time"
 
-	monapi "cloud.google.com/go/monitoring/apiv3"
 	"golang.org/x/build/buildenv"
-	"golang.org/x/build/cmd/coordinator/metrics"
 	"golang.org/x/build/internal/buildgo"
 	dm "google.golang.org/api/deploymentmanager/v2"
-	"google.golang.org/api/option"
-	monpb "google.golang.org/genproto/googleapis/monitoring/v3"
 )
 
 var (
 	makeClusters = flag.String("make-clusters", "go,buildlets", "comma-separated list of clusters to create. Empty means none.")
-	makeMetrics  = flag.Bool("make-metrics", false, "Create the Stackdriver metrics for buildlet monitoring.")
 )
 
 // Deployment Manager V2 manifest for creating a Google Container Engine
@@ -88,12 +83,6 @@
 			log.Fatalf("Error creating Kubernetes cluster %q: %v", c.Name, err)
 		}
 	}
-
-	if *makeMetrics {
-		if err := createMetrics(bgc); err != nil {
-			log.Fatalf("could not create metrics: %v", err)
-		}
-	}
 }
 
 type deploymentTemplateData struct {
@@ -185,24 +174,3 @@
 	}
 	return fmt.Sprintf("%x", buf)
 }
-
-// createMetrics creates the Stackdriver metric types required to monitor
-// buildlets on Stackdriver.
-func createMetrics(bgc *buildgo.Client) error {
-	ctx := context.Background()
-	c, err := monapi.NewMetricClient(ctx, option.WithCredentials(bgc.Creds))
-	if err != nil {
-		return err
-	}
-
-	for _, m := range metrics.Metrics {
-		if _, err = c.CreateMetricDescriptor(ctx, &monpb.CreateMetricDescriptorRequest{
-			Name:             m.DescriptorPath(bgc.Env.ProjectName),
-			MetricDescriptor: m.Descriptor,
-		}); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
diff --git a/go.mod b/go.mod
index b6e483a..7e5c34c 100644
--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,8 @@
 	cloud.google.com/go/datastore v1.1.0
 	cloud.google.com/go/pubsub v1.2.0
 	cloud.google.com/go/storage v1.6.0
+	contrib.go.opencensus.io/exporter/prometheus v0.3.0
+	contrib.go.opencensus.io/exporter/stackdriver v0.13.5
 	github.com/NYTimes/gziphandler v1.1.1
 	github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 // indirect
 	github.com/aws/aws-sdk-go v1.30.15
@@ -16,8 +18,8 @@
 	github.com/davecgh/go-spew v1.1.1
 	github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect
 	github.com/gliderlabs/ssh v0.1.1
-	github.com/golang/protobuf v1.3.4
-	github.com/google/go-cmp v0.4.0
+	github.com/golang/protobuf v1.4.3
+	github.com/google/go-cmp v0.5.5
 	github.com/google/go-github v17.0.0+incompatible
 	github.com/google/go-querystring v1.0.0 // indirect
 	github.com/google/uuid v1.1.2
@@ -27,18 +29,19 @@
 	github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1
 	github.com/kr/pty v1.1.3
 	github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07
+	go.opencensus.io v0.23.0
 	go4.org v0.0.0-20180809161055-417644f6feb5
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
-	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
 	golang.org/x/perf v0.0.0-20180704124530-6e6d33e29852
 	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
-	golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527
-	golang.org/x/text v0.3.2
+	golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e
+	golang.org/x/text v0.3.3
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
 	google.golang.org/api v0.20.0
-	google.golang.org/genproto v0.0.0-20200305110556-506484158171
-	google.golang.org/grpc v1.27.1
+	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
+	google.golang.org/grpc v1.33.2
 	gopkg.in/inf.v0 v0.9.1
 	grpc.go4.org v0.0.0-20170609214715-11d0a25b4919
 )
diff --git a/go.sum b/go.sum
index e2473b6..aedb137 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,5 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
@@ -8,135 +7,249 @@
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
 cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0 h1:GGslhk/BU052LPlnI1vpp3fcbUs+hQ3E+Doti/3/vF8=
 cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
 cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
 cloud.google.com/go v0.54.0 h1:3ithwDMr7/3vpAMXiH+ZQnYbuIsh+OPhUPMFC9enmn0=
 cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go/bigquery v1.0.1 h1:hL+ycaJpVE9M7nLoiXb/Pn10ENE2u+oddxbD8uu0ZVU=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0 h1:xE3CPsOgttP4ACBePh79zTKALtXwn/Edhcr16R5hMWU=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
-cloud.google.com/go/datastore v1.0.0 h1:Kt+gOPPp2LEPWp8CSfxhsM8ik9CcyE/gYu+0r+RnZvM=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0 h1:/May9ojXjRkPBNVrq+oWLqmWCkr4OU5uRY29bu0mRyQ=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/pubsub v1.0.1 h1:W9tAK3E57P75u0XLLR82LZyw8VpAnhmyTOxW9qzmyj8=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0 h1:Lpy6hKgdcl7a3WGSfJIFmxmcdjSpP6OmBEfcOv1Y680=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
-cloud.google.com/go/storage v1.0.0 h1:VV2nUM3wwLLGh9lSABFgZMjInyUbJeaRSE64WuAIQ+4=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
 cloud.google.com/go/storage v1.6.0 h1:UDpwYIwla4jHGzZJaEJYx1tOejbgSoNqsAfHAUYe2r8=
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+contrib.go.opencensus.io/exporter/prometheus v0.3.0 h1:08FMdJYpItzsknogU6PiiNo7XQZg/25GjH236+YCwD0=
+contrib.go.opencensus.io/exporter/prometheus v0.3.0/go.mod h1:rpCPVQKhiyH8oomWgm34ZmgIdZa8OVYO5WAIygPbBBE=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.5 h1:TNaexHK16gPUoc7uzELKOU7JULqccn1NDuqUxmxSqfo=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.5/go.mod h1:aXENhDJ1Y4lIg4EUaVTwzvYETVNZk10Pu26tevFKLUc=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
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 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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 github.com/NYTimes/gziphandler v1.1.1/go.mod h1:n/CVRwUEOgIxrgPvAQhUUr9oeUtvrhMomdKFjzJNB0c=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
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 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
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 github.com/aws/aws-sdk-go v1.30.15/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
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 github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625 h1:ckJgFhFWywOx+YLEMIJsTb+NV6NexWICk5+AMSuz3ss=
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 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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 github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
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+github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/internal/coordinator/pool/gce.go b/internal/coordinator/pool/gce.go
index 8092a77..ae77085 100644
--- a/internal/coordinator/pool/gce.go
+++ b/internal/coordinator/pool/gce.go
@@ -32,7 +32,6 @@
 	"cloud.google.com/go/compute/metadata"
 	"cloud.google.com/go/datastore"
 	"cloud.google.com/go/errorreporting"
-	monapi "cloud.google.com/go/monitoring/apiv3"
 	"cloud.google.com/go/storage"
 	"golang.org/x/build/buildenv"
 	"golang.org/x/build/buildlet"
@@ -80,7 +79,6 @@
 	errTryDeps      error // non-nil if try bots are disabled
 	gerritClient    *gerrit.Client
 	storageClient   *storage.Client
-	metricsClient   *monapi.MetricClient
 	inStaging       bool                   // are we running in the staging project? (named -dev)
 	errorsClient    *errorreporting.Client // Stackdriver errors client
 	gkeNodeIP       string
@@ -157,11 +155,6 @@
 		if err != nil {
 			log.Fatalf("storage.NewClient: %v", err)
 		}
-
-		metricsClient, err = monapi.NewMetricClient(ctx)
-		if err != nil {
-			log.Fatalf("monapi.NewMetricClient: %v", err)
-		}
 	}
 
 	dsClient, err = datastore.NewClient(ctx, buildEnv.ProjectName)
@@ -293,11 +286,6 @@
 	return gcpCreds
 }
 
-// MetricsClient retrieves a metrics client.
-func (c *GCEConfiguration) MetricsClient() *monapi.MetricClient {
-	return metricsClient
-}
-
 func checkTryBuildDeps(ctx context.Context, sc *secret.Client) error {
 	if !hasStorageScope() {
 		return errors.New("coordinator's GCE instance lacks the storage service scope")