docs/api: add node about concurrency on /system/df endpoint
Commit added support for
calling the /system/df endpoint concurrently.
This patch adds a note about this enhancement to the API changes.
@@ -28,6 +28,12 @@ keywords: "API, Docker, rcli, REST, documentation"
computes and returns data only for the specified object type.
The parameter can be specified multiple times to select several object types.
Supported values are: `container`, `image`, `volume`, `build-cache`.
+* `GET /system/df` can now be used concurrently. If a request is made while a
+ previous request is still being processed, the request will receive the result
+ of the already running calculation, once completed. Previously, an error
+ (`a disk usage operation is already running`) would be returned in this
+ situation. This change is not versioned, and affects all API versions if the
+ daemon has this patch.
## v1.41 API changes
