docs: mention request id header (#7088)

Author: n1ru4l

packages/web/docs/src/content/api-reference/usage-reports.mdx

@@ -13,13 +13,14 @@ them in batches (as a single report, when a buffer is full or every few seconds)
 
 > It's recommended to send a report for more than 1 operation. The maximum payload size is 15 MB.
 
-| Name                 | Value                                                                                                                      |
-| -------------------- | -------------------------------------------------------------------------------------------------------------------------- |
-| Endpoint             | `https://app.graphql-hive.com/usage/<ORGANIZATION>/<PROJECT>/<TARGET>` or `https://app.graphql-hive.com/usage/<TARGET_ID>` |
-| Authorization Header | `Authorization: Bearer <ACCESS_TOKEN>`                                                                                     |
-| API version Header   | `X-Usage-API-Version: 2`                                                                                                   |
-| Method               | `POST`                                                                                                                     |
-| Content-Type Header  | `Content-Type: application/json`                                                                                           |
+| Name                 | Value                                                                                                                                         |
+| -------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
+| Endpoint             | `https://app.graphql-hive.com/usage/<ORGANIZATION>/<PROJECT>/<TARGET>` or `https://app.graphql-hive.com/usage/<TARGET_ID>`                    |
+| Authorization Header | `Authorization: Bearer <ACCESS_TOKEN>`                                                                                                        |
+| API version Header   | `X-Usage-API-Version: 2`                                                                                                                      |
+| Request ID Header    | `X-Request-Id: <UUIDv4>` (We recommend sending a unique request id on logging it on your end, so we can help you debugging failing requests.) |
+| Method               | `POST`                                                                                                                                        |
+| Content-Type Header  | `Content-Type: application/json`                                                                                                              |
 
 You can either use the slug or id of the target for the usage reporting endpoint. Be aware that
 using the target ID is more resilient in case you rename either your organization, project or