Azure monitoring REST API Metrics returns only 10 resources

Question

Hi All,

I am running the API below which is supposed to return metrics for multiple VMs. However, the API is returning only 10 VMs. I have tried different subscriptions, different timespans, different intervals and all I get is only 10 VMs from multiple (yet random) resource groups.

Do you know why is this API returning only 10VMs and is there a way to fix it to return all VMs in a subscription?

From Example:

GET https://management.azure.com/subscriptions/12345678-abcd-98765432-abcdef012345/providers/microsoft.Insights/metrics?timespan=2023-06-25T22:20:00.000Z/2023-06-26T22:25:00.000Z&interval=PT5M&metricnames=Percentage CPU&aggregation=average&api-version=2021-05-01&region=eastus&metricNamespace=microsoft.compute/virtualmachines&$filter=Microsoft.ResourceId eq '*'

Documentation:

https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/rest-api-walkthrough?tabs=rest%2Cportal

Thanks,
Sam

Answer 1

Hi,

By default only 10 resources are returned. This is documented on the API top parameter : "The maximum number of records to retrieve per resource ID in the request. Valid only if filter is specified. Defaults to 10.". Try using the top parameter with higher value.

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