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Explicitly set OTel Service Instance ID #700

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Merged
mhutchinson merged 2 commits into from
Feb 16, 2026
Merged

Explicitly set OTel Service Instance ID #700

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59e677d
Explicitly set OTel Service Instance ID
mhutchinson Feb 12, 2026
02a3452
Allow environment variables to override code-configured IDs
mhutchinson Feb 16, 2026
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12 changes: 10 additions & 2 deletions cmd/tesseract/gcp/otel.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ package main
import (
"context"
"errors"
"os"

"go.opentelemetry.io/contrib/detectors/gcp"
"go.opentelemetry.io/otel"
Expand All @@ -27,6 +28,7 @@ import (

mexporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric"
texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
"github.com/google/uuid"
"k8s.io/klog/v2"
)

Expand All @@ -49,14 +51,20 @@ func initOTel(ctx context.Context, traceFraction float64, origin string, project
}
}

instanceID, err := os.Hostname()
if err != nil {
klog.Errorf("os.Hostname() failed, setting OTel service instance ID to UUID. Error: %v", err)
instanceID = uuid.NewString()
}
resources, err := resource.New(ctx,
resource.WithTelemetrySDK(),
resource.WithFromEnv(), // unpacks OTEL_RESOURCE_ATTRIBUTES
// Add your own custom attributes to identify your application
resource.WithAttributes(
semconv.ServiceNameKey.String(origin),
semconv.ServiceNamespaceKey.String("tesseract"),
semconv.ServiceNameKey.String(origin),
semconv.ServiceInstanceIDKey.String(instanceID),
),
resource.WithFromEnv(), // unpacks OTEL_RESOURCE_ATTRIBUTES
resource.WithDetectors(gcp.NewDetector()),
)
if err != nil {
Expand Down
2 changes: 1 addition & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ require (
github.com/gdamore/tcell/v2 v2.13.8
github.com/go-sql-driver/mysql v1.9.3
github.com/google/go-cmp v0.7.0
github.com/google/uuid v1.6.0
github.com/johannesboyne/gofakes3 v0.0.0-20250916175020-ebf3e50324d3
github.com/kylelemons/godebug v1.1.0
github.com/rivo/tview v0.42.0
Expand Down Expand Up @@ -99,7 +100,6 @@ require (
github.com/google/flatbuffers v25.2.10+incompatible // indirect
github.com/google/renameio/v2 v2.0.0 // indirect
github.com/google/s2a-go v0.1.9 // indirect
github.com/google/uuid v1.6.0 // indirect
github.com/googleapis/enterprise-certificate-proxy v0.3.11 // indirect
github.com/googleapis/gax-go/v2 v2.16.0 // indirect
github.com/gorilla/handlers v1.5.2 // indirect
Expand Down
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