Azure EventGrid execution mode takes long time to respond

[avishayil]

Hi, so I think that this is more a design question / issue.

I'm trying to think about the correct implementation method on Azure, let's say I have the following policy in place (From the examples):

  - name: azure-auto-tag-creator
    resource: azure.armresource
    mode:
      type: azure-event-grid
      events: ['VmWrite', 'StorageWrite']
    description: |
      Tag all new VMs and StorageAccounts with the 'Creator Email' tag.
      Note: 'resource-type' filter is not required because policy is not triggered by other resources.
    actions:
     - type: auto-tag-user
       tag: CreatorEmail

So I noticed in the activity log of the storage account, that the operation took almost 10 minutes:

Why is this taking so long? What causes the delay?

• Is it the API operation completion?
• EventGrid subscription?
• Function app warmup?
• Function app polling the queue?
• Function app operation?
• Activity log updates?

Would love to get clarifications as I hoped for a near realtime operation in EvetGrid execution mode