st/api-v2/api/v2/core/base.proto#core-metadata>metadata</a></td><td>Per-cluster metadata</td></tr><tr><td><code>node</code></td><td><a href=https://www.envoyproxy.io/docs/envoy/latest/api-v2/api/v2/core/base.proto#core-node>node</a></td><td>Node description</td></tr><tr><td><code>cluster_name</code></td><td>string</td><td>Upstream cluster name</td></tr><tr><td><code>route_name</code></td><td>string</td><td>Route name</td></tr><tr><td><code>filter_state</code></td><td>map[string, bytes]</td><td>Per-filter st