Removing outdated content (#26050)

content/en/tracing/trace_collection/proxy_setup/_index.md

@@ -527,12 +527,6 @@ of Istio traces are sent to Datadog.
 
 **Note**: These environment variables apply only to the subset of traces indicated by the `values.pilot.traceSampling` setting, hence the required `--set values.pilot.traceSampling=100.0` during Istio configuration.
 
-To use the [Datadog Agent calculated sampling rates][9] (10 traces per second per Agent) and ignore the default sampling rule set to 100%, set the parameter `DD_TRACE_SAMPLING_RULES` to an empty array:
-
-```bash
-DD_TRACE_SAMPLING_RULES='[]'
-```
-
 Explicitly specifying an empty array of rules is different from not specifying rules.
 
 To configure `DD_TRACE_SAMPLING_RULES`, in each deployment whose namespace is labeled `istio-injection=enabled`, set the environment variable as part of the `apm.datadoghq.com/env` annotation of the deployment spec template: