antctl mc doc (#3414)

Signed-off-by: zbangqi <[email protected]>

docs/antctl.md

@@ -33,6 +33,7 @@ running in three different modes:
   - [Flow Aggregator commands](#flow-aggregator-commands)
     - [Dumping flow records](#dumping-flow-records)
     - [Record metrics](#record-metrics)
+  - [Multi-cluster commands](#multi-cluster-commands)
 <!-- /toc -->
 
 ## Installation
@@ -626,3 +627,8 @@ Example outputs of record metrics:
 RECORDS-EXPORTED RECORDS-RECEIVED FLOWS EXPORTERS-CONNECTED
 46               118              7     2      
 ```
+
+### Multi-cluster commands
+
+For information about Antrea Multi-cluster commands, please refer to the
+[antctl Multi-cluster commands](./multicluster/antctl.md).

docs/multicluster/antctl.md

@@ -0,0 +1,30 @@
+# Antctl Multi-cluster commands
+
+Starting from version 1.6.0, Antrea supports the `antctl mc` commands, which can
+collect information from a leader cluster in a ClusterSet, for troubleshooting
+issues in an Antrea Multi-cluster ClusterSet.
+
+All antctl Multi-cluster commands can only run correctly after [deploying Antrea
+Multi-cluster](./user-guide.md) successfully.
+
+- `antctl mc get clusterset` (or `get clustersets`) command can print all
+ClusterSets, a specified Clusterset, or the ClusterSet in a specified leader cluster
+Namespace.
+- `antctl mc get resourceimport` (or `get resourceimports`, `get ri`) command can print
+all ResourceImports, a specified ResourceImport, or ResourceImports in a specified
+Namespace.
+- `antctl mc get resourceexport` (or `get resourceexports`, `get re`) command can print
+all ResourceExports, a specified ResourceExport, ResourceExports in a specified
+Namespace, or ResourceExports in a specific member cluster.
+
+Using the `json` or `yaml` antctl output format can print more information of
+ClusterSet, ResourceImport, and ResourceExport than using the default table
+output format.
+
+```bash
+antctl mc get clusterset [NAME] [-n NAMESPACE] [-o json|yaml] [-A]
+antctl mc get resourceimport [NAME] [-n NAMESPACE] [-o json|yaml] [-A]
+antctl mc get resourceexport [NAME] [-n NAMESPACE] [-clusterid CLUSTERID] [-o json|yaml] [-A]
+```
+
+To see the usage examples of these commands, you may also run `antctl mc get [subcommand] --help`.

hack/.notableofcontents

@@ -28,6 +28,7 @@ docs/maintainers/getting-started-gif.md
 docs/maintainers/release.md
 docs/maintainers/updating-ovs-windows.md
 docs/multicluster/api.md
+docs/multicluster/antctl.md
 docs/multicluster/architecture.md
 docs/multicluster/upgrade.md
 docs/multicluster/user-guide.md