From e3c0aaa5ef4b2fa6ac4818fdebfb0fc2c257a519 Mon Sep 17 00:00:00 2001
From: Chris Eager <chris@signal.org>
Date: Thu, 26 Feb 2026 12:49:33 -0600
Subject: [PATCH] Remove Datadog metrics

---
 cmd/internal/config/config.go |  1 -
 cmd/kt-server/main.go         |  2 +-
 cmd/kt-server/metrics.go      | 12 +-----------
 go.mod                        |  2 --
 go.sum                        |  4 ----
 5 files changed, 2 insertions(+), 19 deletions(-)

diff --git a/cmd/internal/config/config.go b/cmd/internal/config/config.go
index db7bbb0..ef9466d 100644
--- a/cmd/internal/config/config.go
+++ b/cmd/internal/config/config.go
@@ -45,7 +45,6 @@ type Config struct {
 
 	LogOutputFile string `yaml:"log-output"`
 	MetricsAddr   string `yaml:"metrics-addr"`
-	DatadogAddr   string `yaml:"datadog-addr"`
 	OtlpEnabled   bool   `yaml:"otlp-enabled"` // Whether to configure OpenTelemetry Metrics
 	HealthAddr    string `yaml:"health-addr"`
 
diff --git a/cmd/kt-server/main.go b/cmd/kt-server/main.go
index 4797bd7..243ae3d 100644
--- a/cmd/kt-server/main.go
+++ b/cmd/kt-server/main.go
@@ -97,7 +97,7 @@ func main() {
 	go healthServer.Serve(lis)
 
 	// Start the metrics server.
-	exportMetrics(ctx, config.DatadogAddr, config.OtlpEnabled)
+	exportMetrics(ctx, config.OtlpEnabled)
 	go metricsServer(config.MetricsAddr)
 
 	// Start the inserter thread.
diff --git a/cmd/kt-server/metrics.go b/cmd/kt-server/metrics.go
index 0241172..be61b47 100644
--- a/cmd/kt-server/metrics.go
+++ b/cmd/kt-server/metrics.go
@@ -12,7 +12,6 @@ import (
 	"net/http/pprof"
 
 	metrics "github.com/hashicorp/go-metrics"
-	"github.com/hashicorp/go-metrics/datadog"
 	"github.com/hashicorp/go-metrics/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	ktmetrics "github.com/signalapp/keytransparency/cmd/kt-server/metrics"
@@ -42,7 +41,7 @@ func endpointLabel(endpoint string) metrics.Label {
 	return metrics.Label{Name: "endpoint", Value: endpoint}
 }
 
-func exportMetrics(ctx context.Context, addr string, otlpEnabled bool) {
+func exportMetrics(ctx context.Context, otlpEnabled bool) {
 	prom, err := prometheus.NewPrometheusSink()
 	if err != nil {
 		util.Log().Fatalf("building prometheus sink: %v", err)
@@ -50,15 +49,6 @@ func exportMetrics(ctx context.Context, addr string, otlpEnabled bool) {
 	sink := metrics.FanoutSink{prom}
 	defer sink.Shutdown()
 
-	if addr != "" {
-		util.Log().Infof("Initiating datadog metrics at %q", addr)
-		ddog, err := datadog.NewDogStatsdSink(addr, "")
-		if err != nil {
-			util.Log().Fatalf("error initializing statsd client: %v", err)
-		}
-		sink = append(sink, ddog)
-	}
-
 	if otlpEnabled {
 		util.Log().Infof("Initiating otlp metrics")
 		otlpSink, err := ktmetrics.NewOTLPSink(ctx)
diff --git a/go.mod b/go.mod
index decb6b0..1fcb576 100644
--- a/go.mod
+++ b/go.mod
@@ -32,8 +32,6 @@ require (
 )
 
 require (
-	github.com/DataDog/datadog-go v4.8.3+incompatible // indirect
-	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.3 // indirect
 	github.com/aws/aws-sdk-go-v2/credentials v1.19.2 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.14 // indirect
diff --git a/go.sum b/go.sum
index 8298430..f48f8a5 100644
--- a/go.sum
+++ b/go.sum
@@ -3,10 +3,6 @@ filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
 filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/DATA-DOG/go-sqlmock v1.4.1/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
-github.com/DataDog/datadog-go v4.8.3+incompatible h1:fNGaYSuObuQb5nzeTQqowRAd9bpDIRRV4/gUtIBjh8Q=
-github.com/DataDog/datadog-go v4.8.3+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
-github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
-github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=