istio.io/content/help/faq/telemetry/no-tracing.md

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Requests are not being traced 20

Since Istio 1.0.3, the default sampling rate for tracing has been reduced to 1% when installing Istio using the Helm chart. This means that only 1 out of 100 trace instances captured by Istio will be reported to the tracing backend. The sampling rate in the istio-demo.yaml is still set to 100%. See this section for more information on how to set the sampling rate.