add Prometheus bridge to otel

Author: jmank88

.changeset/happy-books-boil.md

@@ -0,0 +1,5 @@
+---
+"chainlink": minor
+---
+
+Add Telemetry.PrometheusBridge to TOML config to support forwarding Prometheus metrics through Open Telemetry

core/config/docs/core.toml

@@ -872,7 +872,6 @@ ChipIngressEndpoint = '' # Default
 ChipIngressInsecureConnection = false # Default
 # DurableEmitterEnabled enables persisting outbound CHIP events to Postgres for at-least-once delivery.
 DurableEmitterEnabled = false # Default
-
 # HeartbeatInterval is the interval at which a the application heartbeat is sent to telemetry backends.
 HeartbeatInterval = '1s' # Default
 # LogLevel sets the log level for telemetry streaming (debug, info, warn, error, crit, panic, fatal)
@@ -895,6 +894,14 @@ LogMaxQueueSize = 2048 # Default
 # foo is an example resource attribute
 foo = "bar" # Example
 
+# The Prometheus bridge automatically forwards metrics through open telemetry.
+[Telemetry.PrometheusBridge]
+# Enabled enables the Promtheus bridge.
+Enabled = false # Default
+# Prefixes is a set of filters to restrict which prometheus metrics are forwarded based on prefix matching.
+# By default, we only forward the go runtime metrics. Empty means forward everything.
+Prefixes = ["go_"] # Default
+
 [CRE.Streams]
 # WsURL is the websockets url for the streams sdk config
 WsURL = "streams.url" # Example

core/config/telemetry_config.go

@@ -27,4 +27,10 @@ type Telemetry interface {
 	LogExportMaxBatchSize() int
 	LogExportInterval() time.Duration
 	LogMaxQueueSize() int
+	PrometheusBridge() PrometheusBridge
+}
+
+type PrometheusBridge interface {
+	Enabled() bool
+	Prefixes() []string
 }

core/config/toml/types.go

@@ -2868,6 +2868,8 @@ type Telemetry struct {
 	LogExportMaxBatchSize         *int
 	LogExportInterval             *commonconfig.Duration
 	LogMaxQueueSize               *int
+
+	PrometheusBridge PrometheusBridge `toml:",omitempty"`
 }
 
 func (b *Telemetry) setFrom(f *Telemetry) {
@@ -2931,6 +2933,7 @@ func (b *Telemetry) setFrom(f *Telemetry) {
 	if v := f.LogMaxQueueSize; v != nil {
 		b.LogMaxQueueSize = v
 	}
+	b.PrometheusBridge.setFrom(&f.PrometheusBridge)
 }
 
 func (b *Telemetry) ValidateConfig() (err error) {
@@ -2952,6 +2955,20 @@ func (b *Telemetry) ValidateConfig() (err error) {
 	return err
 }
 
+type PrometheusBridge struct {
+	Enabled  *bool
+	Prefixes []string
+}
+
+func (b *PrometheusBridge) setFrom(f *PrometheusBridge) {
+	if v := f.Enabled; v != nil {
+		b.Enabled = v
+	}
+	if v := f.Prefixes; v != nil {
+		b.Prefixes = v
+	}
+}
+
 var hostnameRegex = regexp.MustCompile(`^[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*$`)
 
 // Validates uri is valid external or local URI

core/scripts/go.mod

@@ -43,7 +43,7 @@ require (
 	github.com/smartcontractkit/chain-selectors v1.0.100
 	github.com/smartcontractkit/chainlink-automation v0.8.1
 	github.com/smartcontractkit/chainlink-ccip/chains/evm v0.0.0-20260506144252-c100eabfda74
-	github.com/smartcontractkit/chainlink-common v0.11.2-0.20260518100439-9564f35fd264
+	github.com/smartcontractkit/chainlink-common v0.11.2-0.20260520224710-ed772131f8f0
 	github.com/smartcontractkit/chainlink-common/keystore v1.1.0
 	github.com/smartcontractkit/chainlink-data-streams v0.1.15-0.20260520173048-0333bc7b082f
 	github.com/smartcontractkit/chainlink-deployments-framework v0.105.0
@@ -480,7 +480,7 @@ require (
 	github.com/smartcontractkit/chainlink-ccip/chains/solana v0.0.0-20260506144252-c100eabfda74 // indirect
 	github.com/smartcontractkit/chainlink-ccip/chains/solana/gobindings v0.0.0-20260511195239-0f6e1b177fc7 // indirect
 	github.com/smartcontractkit/chainlink-ccv v0.0.2-0.20260428133800-3b1484e8b1fd // indirect
-	github.com/smartcontractkit/chainlink-common/pkg/chipingress v0.0.11-0.20260511200925-b94130438417 // indirect
+	github.com/smartcontractkit/chainlink-common/pkg/chipingress v0.0.11-0.20260518142424-bacfb6ba4146 // indirect
 	github.com/smartcontractkit/chainlink-evm/contracts/cre/gobindings v0.0.0-20260403151002-2c91155b5501 // indirect
 	github.com/smartcontractkit/chainlink-feeds v0.1.2-0.20250227211209-7cd000095135 // indirect
 	github.com/smartcontractkit/chainlink-framework/capabilities v0.0.0-20260423135514-5b1a7565a99c // indirect
@@ -566,6 +566,7 @@ require (
 	go.etcd.io/bbolt v1.4.3 // indirect
 	go.mongodb.org/mongo-driver v1.17.9 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.68.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.49.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.68.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.67.0 // indirect

core/scripts/go.sum

@@ -174,3 +174,19 @@ func (b *telemetryConfig) LogMaxQueueSize() int {
 	}
 	return *b.s.LogMaxQueueSize
 }
+
+func (b *telemetryConfig) PrometheusBridge() config.PrometheusBridge {
+	return &prometheusBridgeConfig{b.s.PrometheusBridge}
+}
+
+type prometheusBridgeConfig struct {
+	s toml.PrometheusBridge
+}
+
+func (p *prometheusBridgeConfig) Enabled() bool {
+	return *p.s.Enabled
+}
+
+func (p *prometheusBridgeConfig) Prefixes() []string {
+	return p.s.Prefixes
+}

core/services/chainlink/config_telemetry.go

@@ -51,6 +51,10 @@ ChainID = '1'
 URL = 'prom.test'
 ServerPubKey = 'test-pub-key'
 
+[Telemetry.PrometheusBridge]
+Enabled = true
+Prefixes = ["ocr_"]
+
 [AuditLogger]
 Enabled = true
 ForwardToUrl = 'http://localhost:9898'

core/services/chainlink/testdata/config-full.toml

@@ -357,6 +357,10 @@ LogExportMaxBatchSize = 512
 LogExportInterval = '1s'
 LogMaxQueueSize = 2048
 
+[Telemetry.PrometheusBridge]
+Enabled = false
+Prefixes = ["go_"]
+
 [Workflows]
 [Workflows.Limits]
 Global = 200

core/web/resolver/testdata/config-empty-effective.toml

@@ -357,6 +357,10 @@ LogExportMaxBatchSize = 512
 LogExportInterval = '1s'
 LogMaxQueueSize = 2048
 
+[Telemetry.PrometheusBridge]
+Enabled = false
+Prefixes = ["go_"]
+
 [Workflows]
 [Workflows.Limits]
 Global = 200