docs: change_for_status_and_index_of_maintain_folder (#3478)

* Change for status and index of maintain folder

* Update status.md

* Update status.md

---------

Co-authored-by: Siqi Wang <[email protected]>

docs/en/maintain/index.rst

@@ -10,6 +10,8 @@ Maintenance
     backup
     monitoring
     cli
+    status
+    multi_cluster
     faq
     scale
     diagnose

docs/en/maintain/status.md

@@ -0,0 +1,33 @@
+# Maintenance Command Status
+
+After executing maintenance operations, you can monitor the outcomes of these operations, along with the current health status of the database, through a series of commonly used command combinations. By sequentially running the `showopstatus` and `showtablestatus` commands, you can ultimately verify the successful completion of the relevant maintenance tasks.
+
+## Step 1: View Command Status with `showopstatus`
+
+The `showopstatus` command serves the purpose of observing the execution status of specific maintenance commands. The current NS client supports this command to track the status of maintenance commands like `addreplica`, `delreplica`, `migrate`, `offlineendpoint`, `recoverendpoint`, `changeleader`, and `recovertable`. For a comprehensive understanding of these supported maintenance commands, refer to the [Operations CLI](./cli.md) document.
+
+You can monitor the status of relevant commands by utilizing the `showopstatus` command of the [OpenMLDB Operations Tool](./openmldb_ops.md) `openmldb_ops.py`, as shown in the example below:
+
+```bash
+python tools/openmldb_ops.py --openmldb_bin_path=./bin/openmldb --zk_cluster=127.0.0.1:2181 --zk_root_path=/openmldb --cmd=showopstatus
+```
+
+Due to the asynchronous nature of maintenance command execution, you might need to run the `showopstatus` command multiple times to confirm the final state. The state transitions for related commands can occur in three stages:
+
+1. kInited => kDoing => kDone: Indicates successful command execution.
+2. kInited => kDoing => kFailed: Denotes a failed command execution.
+3. kInited => kCancelled: This state may arise after manually executing the `cancelop` command.
+
+Once the command running status changes to `kDone`, it signifies the successful execution of relevant commands. You can then proceed to the subsequent steps and use the `showtablestatus` command to inspect the status of tables.
+
+## Step 2: View Table Status with `showtablestatus`
+
+After successfully executing the relevant maintenance commands, it's crucial to perform an additional verification to identify any anomalies in the table status. This verification can be conducted using the `showtablestatus` command within the [OpenMLDB Operations and Maintenance Tool](./openmldb_ops.md). For instance:
+
+```bash
+python tools/openmldb_ops.py --openmldb_bin_path=./bin/openmldb --zk_cluster=127.0.0.1:2181 --zk_root_path=/openmldb --cmd=showtablestatus
+```
+
+Upon execution, this command will generate a series of table-related information. Of particular importance is the column labeled `Partition_unalive`. If this column's value is 0, it signifies that the table is in a normal state. Conversely, any non-zero value indicates the presence of an anomaly, as illustrated in the following example:
+
+![image-20230113144942187](images/showtablestatus.png)