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Add enableContextPropagation field to Telemetry Tracing API #3645

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Add enableContextPropagation field to Telemetry Tracing API #3645

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a8f2ce8
Add enableContextPropagation field to Telemetry Tracing API
prashanthjos Feb 3, 2026
4a1b3fb
Adding the release note
prashanthjos Feb 3, 2026
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12 changes: 12 additions & 0 deletions kubernetes/customresourcedefinitions.gen.yaml
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9 changes: 9 additions & 0 deletions releasenotes/notes/58871.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
apiVersion: release-notes/v2
kind: feature
area: telemetry
issue:
- https://github.com/istio/istio/issues/58871

releaseNotes:
- |
**Added** `enableContextPropagation` field to the Telemetry Tracing API, allowing users to disable trace context header propagation (e.g., X-B3-*, traceparent) independently from span reporting. This is useful for preventing trace context leakage at egress gateways while maintaining internal observability.
95 changes: 64 additions & 31 deletions telemetry/v1alpha1/telemetry.pb.go
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30 changes: 30 additions & 0 deletions telemetry/v1alpha1/telemetry.pb.html
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28 changes: 27 additions & 1 deletion telemetry/v1alpha1/telemetry.proto
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Expand Up @@ -232,6 +232,22 @@ syntax = "proto3";
// - disabled: true
// ```
//
// Disable trace context propagation on egress gateway while still reporting spans
// (prevents leaking trace headers to external services):
// ```yaml
// apiVersion: telemetry.istio.io/v1
// kind: Telemetry
// metadata:
// name: egress-no-propagation
// namespace: istio-system
// spec:
// selector:
// matchLabels:
// istio: egressgateway
// tracing:
// - enableContextPropagation: false
// ```
//
package istio.telemetry.v1alpha1;

import "google/api/field_behavior.proto";
Expand Down Expand Up @@ -435,8 +451,18 @@ message Tracing {
// By default Istio specific tags are included in the trace spans.
google.protobuf.BoolValue enable_istio_tags = 8;

// Controls whether trace context headers (e.g., `traceparent`/`tracestate` for W3C,
// `X-B3-*` for Zipkin) are propagated in forwarded requests.
// When set to false, trace context headers will not be included in proxied requests,
// effectively stopping trace context propagation at the selected workloads.
// This is useful for egress gateways where you want to prevent leaking trace context
// to external services while still reporting spans for internal observability.
// Defaults to true (context propagation enabled).
// NOTE: This does NOT impact span reporting; use `disable_span_reporting` to control that.
google.protobuf.BoolValue enable_context_propagation = 9;

// $hide_from_docs
// Next available field number: 9
// Next available field number: 10
}

// Used to bind Telemetry configuration to specific providers for
Expand Down