AKS: omsagent config key doesn't honor case after disabling and then enabling it

[magodo]

A first create AKS with omsagent set to enabled, the omsagent config key is case sensitive:

Create AKS with omsagent enabled

REQUEST
{
    ...
    "properties": {
        "addonProfiles": {
            "omsagent": {
                "config": {
                    "logAnalyticsWorkspaceResourceID": "/subscriptions/0-0-0-0/resourcegroups/example222/providers/microsoft.operationalinsights/workspaces/example222"
                },
                "enabled": true
            }
        }
    },
    ...
}
RESPONSE
(same as REQUEST)

Then if I disable the omsagent then enable it, the case of the omsagent.config is lost (i.e. logAnalyticsWorkspaceResourceID):

Enable omsagent after firstly disabling it

REQUEST
{
    ...
    "properties": {                                                                                                                                                                                                                                                                       
        "addonProfiles": {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
            "omsagent": {                                                                                                                                                                                                                                                                 
                "config": {                                                                                                                                                                                                                                                               
                    "logAnalyticsWorkspaceResourceID": "/subscriptions/0-0-0-0/resourcegroups/example222/providers/microsoft.operationalinsights/workspaces/example222"                                                                                      
                },                                                                                                                                                                                                                                                                        
                "enabled": true                                                                                                                                                                                                                                                           
            }                                                                                                                                                                                                                                                                             
        }
    },
    ...
}

RESPONSE
{
    ...
    "properties": {                                                                                                                                                                                                                                                                       
        "addonProfiles": {                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
            "omsagent": {                                                                                                                                                                                                                                                                 
                "config": {                                                                                                                                                                                                                                                               
                    "loganalyticsworkspaceresourceid": "/subscriptions/0-0-0-0/resourcegroups/example222/providers/microsoft.operationalinsights/workspaces/example222"                                                                                      
                },                                                                                                                                                                                                                                                                        
                "enabled": true                                                                                                                                                                                                                                                           
            }                                                                                                                                                                                                                                                                             
        }
    },
    ...
}

The expected behavior is to always respect the case.

Related issue: hashicorp/terraform-provider-azurerm#8344

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Azure/aks-pm.

[tombuildsstuff]

One fix for this would be to model this as a struct in the swagger, rather than a dictionary? Whilst being a dictionary can be convenient (in that new fields can be added without modifying the swagger) it allows breaking changes to slip through unnoticed - so this may be better long-term, since this is the second/third time this has happened that I can recall?

[magodo]

Edit: the same issue happens on httpApplicationRouting config key httpapplicationroutingzonename.

See: hashicorp/terraform-provider-azurerm#8326