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Metrics for Application Gateway for Containers

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Application Gateway for Containers publishes data points to Azure Monitor for the performance of your Application Gateway for Containers and backend instances. These data points are called metrics, and are numerical values in an ordered set of time-series data. Metrics describe some aspect of your application gateway at a particular time. If there are requests flowing through the Application Gateway, it measures and sends its metrics in 60-second intervals. If there are no requests flowing through the Application Gateway or no data for a metric, the metric isn't reported. For more information, see Azure Monitor metrics.

Metrics supported by Application Gateway for Containers

Metric Name Description Aggregation Type Dimensions
Backend Connection Timeouts Count of requests that timed out waiting for a response from the backend target (includes all retry requests initiated from Application Gateway for Containers to the backend target) Total Backend Service
Backend Healthy Targets Count of healthy backend targets Avg Backend Service
Backend HTTP Response Status HTTP response status returned by the backend target to Application Gateway for Containers Total Backend Service, HTTP Response Code
Connection Timeouts Count of connections closed due to timeout between clients and Application Gateway for Containers Total Frontend
HTTP Response Status HTTP response status returned by Application Gateway for Containers Total Frontend, HTTP Response Code
Total Connection Idle Timeouts Count of connections closed, between client and Application Gateway for Containers frontend, due to exceeding idle timeout Total Frontend
Total Requests Count of requests Application Gateway for Containers has served Total Frontend

View Application Gateway for Containers metrics

Use the following steps to view Application Gateway for Containers in the Azure portal.

  1. Sign in to the Azure portal with your Azure account.

  2. In Search resources, service, and docs, type Application Gateways for Containers and select your Application Gateway for Containers name.

  3. Under Monitoring, select Metrics.

  4. Next to Chart Title, enter a title for your metrics view.

  5. Scope and Metric Namespace are is automatically populated. Under Metric, select a metric such as: Total Requests. For the Total Requests metric, the Aggregation is set to Sum.

  6. Select Add filter. Property is set to Frontend. Choose the = (equals) Operator.

  7. Enter values to use for filtering under Values.

    For example:

    • frontend-primary:80
    • ingress-frontend:443
    • ingress-frontend:80

  8. Select the values you want to actively filter from the entries you create.

  9. Choose Apply Splitting, select Frontend, and accept default values for Limit and Sort. See the following example:

Total Requests

Application Gateway for Containers metrics total requests

The following are some other useful chart examples:

HTTP Response Status

In the HTTP response status example is shown, a filter can be applied to quickly identify trends on response codes returned to client requests. Optionally, a filter may be applied to further monitor a specific grouping of HTTP response codes.

Application Gateway for Containers metrics HTTP response status

Backend Health Targets

In the backend health targets example shown, the number of healthy backend targets increases from 1 to 2 for Kubernetes service echo and then decreases to 1. This validates that Application Gateway for Containers is able to detect the new replica, begin load balancing to the replica, and then remove the replica when the replica count is decreased in Kubernetes.

Application Gateway for Containers metrics backend healthy targets

Next steps