istio

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apiVersion: release-notes/v2
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kind: feature
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area: telemetry
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releaseNotes:
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  - |
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    **Removed** default tracing configuration that enables tracing to `zipkin.istio-system.svc`. See upgrade notes for more information.
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upgradeNotes:
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  - title: Default tracing to `zipkin.istio-system.svc` removed
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    content: |
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      In previous versions of Istio, tracing was automatically configured to send traces to `zipkin.istio-system.svc`.
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      This default setting has been removed; users will need to explicitly configure where to send traces moving forward.
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      `istioctl x precheck --from-version=1.21` can automatically detect if you may be impacted by this change.
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      If you previously had tracing enabled implicitly, you can enable it by doing one of:
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      * Installing with `--set compatibilityVersion=1.21`.
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      * Following [Configure tracing with Telemetry API](/docs/tasks/observability/distributed-tracing/telemetry-api/).
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