Update deaults.py

Author: bragi92

src/k8s-extension/azext_k8s_extension/partner_extensions/azuremonitormetrics/deaults.py

@@ -8,7 +8,7 @@
 def get_default_region(cmd):
     cloud_name = cmd.cli_ctx.cloud.name
     if cloud_name.lower() == 'azurechinacloud':
-        raise CLIError("Azure China Cloud is not supported for the Azure Monitor Metrics addon")
+        return "chinanorth3"
     if cloud_name.lower() == 'azureusgovernment':
         return "usgovvirginia"
     return "eastus"