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<p><code>EnvoyFilter</code> provides a mechanism to customize the Envoy
configuration generated by istiod. Use EnvoyFilter to modify
values for certain fields, add specific filters, or even add
entirely new listeners, clusters, etc. This feature must be used
with care, as incorrect configurations could potentially
destabilize the entire mesh. Unlike other Istio networking objects,
EnvoyFilters are additively applied. Any number of EnvoyFilters can
exist for a given workload in a specific n