Add changeset

.changesets/feat_error_extensions_service.md

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+### Add `extensions.service` for all subgraph errors ([PR #6191](https://github.com/apollographql/router/pull/6191))
+
+If `include_subgraph_errors` is `true` for a particular subgraph, all errors originating in this subgraph will have the subgraph's name exposed as a `service` extension.
+
+For example, if subgraph errors are enabled, like so:
+```yaml title="router.yaml"
+include_subgraph_errors:
+  all: true # Propagate errors from all subgraphs
+```
+Note: This option is enabled by default in the [dev mode](./configuration/overview#dev-mode-defaults).
+
+And this `products` subgraph returns an error, it will have a `service` extension:
+
+```json
+{
+  "data": null,
+  "errors": [
+    {
+      "message": "Invalid product ID",
+      "path": [],
+      "extensions": {
+        "service": "products"
+      }
+    }
+  ]
+}
+```
+
+By [@IvanGoncharov](https://github.com/IvanGoncharov) in https://github.com/apollographql/router/pull/6191