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[cost-analysis] Add a note about cost-analysis-identity #174

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[cost-analysis] Add a note about cost-analysis-identity #174

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9 changes: 9 additions & 0 deletions articles/aks/cost-analysis.md
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Expand Up @@ -71,6 +71,15 @@ az aks update --resource-group <resource-group> --name <cluster-name> --enable-c
> [!WARNING]
> The AKS cost analysis add-on Memory usage is dependent on the number of containers deployed. You can roughly approximate Memory consumption using *200 MB + 0.5 MB per container*. The current Memory limit is set to *4 GB*, which supports approximately *7000 containers per cluster*. These estimates are subject to change.

> [!NOTE]
> Enabling the cost analysis also creates a [managed identity](/entra/identity/managed-identities-azure-resources/overview) named `cost-analysis-identity` with read access to the cluster's node resource group, and assigns it to the node pools in the cluster.
> This is used to collect the ARM identifiers of cluster assets for reporting.
>
> Since there is already a managed identity for the node pool itself, any commands on the node that use managed identities will need to [specify the identity to use](/entra/identity/managed-identities-azure-resources/managed-identities-faq#what-identity-will-imds-default-to-if-i-dont-specify-the-identity-in-the-request) rather than relying on the default.
>
> For example, `az login --identity --resource-id <resource ID of identity>`.


## Disable cost analysis on your AKS cluster

Disable cost analysis using the [`az aks update`][az-aks-update] command with the `--disable-cost-analysis` flag.
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