/templates/><em>templates</em></a> are used to describe the exact data that an adapter consumes at request time.</p><p>Each template is specified as a <a href=https://developers.google.com/protocol-buffers/>protobuf</a> message. A single template describes a bundle of data that is delivered to one or more adapters at runtime. Any given adapter can be designed to support any number of templates, the specific templates the adapter supports is determined by the adapter developer.</p><p><a href=https://istio.io