There is a command group 'az_stack hci_extension'. This group of commands could 'manage extension with stack hci'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_stack hci_extension_create'.The syntax is: az stack-hci extension create --arc-setting-name
                              --cluster-name
                              --extension-name
                              --resource-group
                              [--auto-upgrade {0, 1, f, false, n, no, t, true, y, yes}]
                              [--force-update-tag]
                              [--no-wait {0, 1, f, false, n, no, t, true, y, yes}]
                              [--protected-settings]
                              [--publisher]
                              [--settings]
                              [--type]
                              [--type-handler-version]. The 1th example of the child command would be to use it to 'create arc extension', the syntax is: az stack-hci extension create --arc-setting-name "default" --cluster-name "myCluster" --type "MicrosoftMonitoringAgent" --protected-settings '{"workspaceId": "xx", "port": "6516"}' --publisher "Microsoft.Compute" --settings '{"workspaceKey": "xx"}' --type-handler-version "1.10" --name "MicrosoftMonitoringAgent" --resource-group "test-rg". The parameter '--arc-setting-name' is required. It is used to the name of the proxy resource holding details of hci arcsetting information.. The parameter '--cluster-name' is required. It is used to the name of the cluster.. The parameter '--extension-name --name -n' is required. It is used to the name of the machine extension.. The parameter '--resource-group -g' is required. It is used to name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--auto-upgrade' is optional. indicates whether the extension should use a newer minor version if one is available at deployment time. once deployed, however, the extension will not upgrade minor versions unless redeployed, even with this property set to true.. The parameter '--force-update-tag' is optional. how the extension handler should be forced to update even if the extension configuration has not changed.. The parameter '--no-wait' is optional. do not wait for the long-running operation to finish.. The parameter '--protected-settings' is optional. protected settings (may contain secrets).  support json-file and yaml-file.. The parameter '--publisher' is optional. the name of the extension handler publisher.. The parameter '--settings' is optional. json formatted public settings for the extension.  support json-file and yaml-file.. The parameter '--type' is optional. specifies the type of the extension; an example is "customscriptextension".. The parameter '--type-handler-version' is optional. specifies the version of the script handler. latest version would be used if not specified.. 