.
The values for <code>destination_service</code> default to the host header if the Istio proxy is not able to determine the destination service from other request metadata.
If clients are using a variety of host headers, this could result in a large number of values for the <code>destination_service</code>.
In this case, follow the <a href=/v1.16/docs/tasks/observability/metrics/customize-metrics/>metric customization</a> guide to disable host header fallback mesh wide.
To disable host header fallback for 