Cannot create diagnostic settings for a subscription

Describe the bug When trying to create diagnostic settings for a subscription, the command fails. Error seem to indicate that a resource group is required, but since its a subscription this cannot be provided.

$ az monitor diagnostic-settings create --name "Event logs" --resource "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
usage: az monitor diagnostic-settings create [-h] [--verbose] [--debug] [--output {json,jsonc,table,tsv,yaml,none}] [--query JMESPATH]
                                             [--subscription _SUBSCRIPTION] --name NAME --resource RESOURCE_URI [--logs LOGS]
                                             [--metrics METRICS] [--event-hub EVENT_HUB] [--event-hub-rule EVENT_HUB_RULE]
                                             [--storage-account STORAGE_ACCOUNT] [--workspace WORKSPACE] [--resource-namespace NAMESPACE]
                                             [--resource-parent PARENT] [--resource-type RESOURCE_TYPE]
                                             [--resource-group RESOURCE_GROUP_NAME]
az monitor diagnostic-settings create: error: 'resource_group'

To Reproduce Run the following command:

az monitor diagnostic-settings create --name "Event logs" --resource "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"

Additional parameters does not alter the outcome.

Expected behavior Expected a diagnostic setting to be created for the subscription.

Environment summary Tested on both MacOS and Windows.

MacOS: macOS-10.15.3-x86_64-i386-64bit Python 3.8.1 Shell: bash azure-cli 2.0.79

Ubuntu (WSL): Linux-4.4.0-17134-Microsoft-x86_64-with-debian-buster-sid Python 3.6.5 Shell: bash azure-cli 2.0.81

Additional context Ran into the issue when trying to send activity logs from a subscription to an event hub.

[yonzhan]

add to S167.

[nishantsondhi16]

https://medium.com/@sondhi.nishant/azure-activity-logs-eventhub-using-arm-template-295147558cfd