There is a command group 'az_acr_pipeline run'. This group of commands could 'manage acr import and export pipeline runs'. 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_acr_pipeline run_clean'.The syntax is: az acr pipeline-run clean --registry
                          --resource-group
                          [--dry-run]. The 1th example of the child command would be to use it to 'delete all failed pipeline runs on the registry', the syntax is: az acr pipeline-run clean --resource-group $MyRG --registry $MyReg. The 2th example of the child command would be to use it to 'list the failed pipeline runs that would have been deleted  but do not delete any', the syntax is: az acr pipeline-run clean --resource-group $MyRG --registry $MyReg --dry-run -o table. The parameter '--registry -r' is required. It is used to name of registry.. 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 '--dry-run' is optional. list the failed pipeline-runs that would have been deleted, but do not delete any.. 