🏷️ Tagging Strategies for Azure and OCI

# Example PowerShell script to add Owner tag to all VMs
$vms = Get-AzVM
foreach ($vm in $vms) {
    if (-not $vm.Tags.ContainsKey('Owner')) {
        $creator = Get-AzLog -ResourceId $vm.Id -MaxRecord 1 | Where-Object {$_.OperationName.Value -eq 'Microsoft.Compute/virtualMachines/write'}
        if ($creator) {
            $ownerEmail = $creator.Caller
            Update-AzTag -ResourceId $vm.Id -Tag @{'Owner'=$ownerEmail} -Operation Merge
        }
    }
}

# Example Python script to tag OCI instances from audit logs
import oci

# Initialize OCI clients
config = oci.config.from_file()
audit_client = oci.audit.AuditClient(config)
compute_client = oci.core.ComputeClient(config)
identity_client = oci.identity.IdentityClient(config)

# Get compartment ID
compartment_id = config["tenancy"]

# Get instances without CreatedDate tag
instances = compute_client.list_instances(compartment_id).data
for instance in instances:
    if "CreatedDate" not in instance.defined_tags.get("FinOps", {}):
        # Get creation event from audit logs
        events = audit_client.list_events(
            compartment_id=compartment_id,
            start_time=oci.audit.models.TimeRange(
                date_time_greater_than_or_equal_to=oci.util.date_time_utils.get_past_days(30)
            ),
            end_time=oci.util.date_time_utils.now()
        ).data
        
        # Find creation event
        for event in events:
            if event.resource_id == instance.id and "Create" in event.event_name:
                # Add CreatedDate tag
                defined_tags = instance.defined_tags
                if "FinOps" not in defined_tags:
                    defined_tags["FinOps"] = {}
                defined_tags["FinOps"]["CreatedDate"] = event.event_time.strftime("%Y-%m-%d")
                
                # Update instance tags
                compute_client.update_instance(
                    instance_id=instance.id,
                    update_instance_details=oci.core.models.UpdateInstanceDetails(
                        defined_tags=defined_tags
                    )
                )
                break