Replace OpenCensus with OpenTelemetry for metrics

- Migrate pkg/util/metrics/helpers.go from OpenCensus tags to OTel attributes
- Migrate pkg/util/metrics/metric_int64.go to use OTel metric SDK
- Migrate pkg/util/metrics/metric_float64.go to use OTel metric SDK
- Add pkg/util/metrics/provider.go for global MeterProvider management
- Update prometheusexporter to use OTel Prometheus exporter
- Update stackdriver exporter to use GCP OTel metric exporter
- Remove OpenCensus dependencies from go.mod
- Add OpenTelemetry SDK and exporter dependencies

Co-authored-by: MartinForReal <[email protected]>

Author: Copilot

go.mod

@@ -4,20 +4,24 @@ go 1.25.5
 
 require (
 	cloud.google.com/go/compute/metadata v0.9.0
-	contrib.go.opencensus.io/exporter/prometheus v0.4.2
-	contrib.go.opencensus.io/exporter/stackdriver v0.13.14
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.54.0
 	github.com/acobaugh/osrelease v0.1.0
 	github.com/avast/retry-go/v4 v4.7.0
 	github.com/coreos/go-systemd/v22 v22.6.0
 	github.com/euank/go-kmsg-parser v2.0.0+incompatible
 	github.com/hpcloud/tail v1.0.0
+	github.com/prometheus/client_golang v1.23.2
 	github.com/prometheus/client_model v0.6.2
 	github.com/prometheus/common v0.67.4
 	github.com/prometheus/procfs v0.19.2
 	github.com/shirou/gopsutil/v4 v4.25.11
 	github.com/spf13/pflag v1.0.10
 	github.com/stretchr/testify v1.11.1
-	go.opencensus.io v0.24.0
+	go.opentelemetry.io/otel v1.38.0
+	go.opentelemetry.io/otel/exporters/prometheus v0.60.0
+	go.opentelemetry.io/otel/metric v1.38.0
+	go.opentelemetry.io/otel/sdk v1.38.0
+	go.opentelemetry.io/otel/sdk/metric v1.38.0
 	golang.org/x/sys v0.39.0
 	google.golang.org/api v0.258.0
 	k8s.io/api v0.35.0
@@ -31,33 +35,26 @@ require (
 	cloud.google.com/go/auth v0.17.0 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/monitoring v1.24.2 // indirect
-	cloud.google.com/go/trace v1.11.6 // indirect
-	github.com/aws/aws-sdk-go v1.44.72 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.54.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/ebitengine/purego v0.9.1 // indirect
 	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
-	github.com/go-kit/log v0.2.1 // indirect
-	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-openapi/jsonpointer v0.21.0 // indirect
 	github.com/go-openapi/jsonreference v0.20.2 // indirect
 	github.com/go-openapi/swag v0.23.0 // indirect
-	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/google/s2a-go v0.1.9 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.7 // indirect
 	github.com/googleapis/gax-go/v2 v2.15.0 // indirect
-	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/grafana/regexp v0.0.0-20240518133315-a468a5bfb3bc // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
@@ -67,18 +64,13 @@ require (
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
-	github.com/prometheus/client_golang v1.23.2 // indirect
-	github.com/prometheus/prometheus v0.35.0 // indirect
-	github.com/prometheus/statsd_exporter v0.22.7 // indirect
+	github.com/prometheus/otlptranslator v0.0.2 // indirect
 	github.com/tklauser/go-sysconf v0.3.16 // indirect
 	github.com/tklauser/numcpus v0.11.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.61.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
-	go.opentelemetry.io/otel v1.38.0 // indirect
-	go.opentelemetry.io/otel/metric v1.38.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.63.0 // indirect
 	go.opentelemetry.io/otel/trace v1.38.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
@@ -89,7 +81,7 @@ require (
 	golang.org/x/term v0.38.0 // indirect
 	golang.org/x/text v0.32.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	google.golang.org/genproto v0.0.0-20250603155806-513f23925822 // indirect
+	google.golang.org/genproto v0.0.0-20250922171735-9219d122eba9 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20251022142026-3a174f9686a8 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20251213004720-97cd9d5aeac2 // indirect
 	google.golang.org/grpc v1.77.0 // indirect
@@ -98,7 +90,6 @@ require (
 	gopkg.in/fsnotify.v1 v1.4.7 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect