Container Service for Kubernetes (ACK) clusters are compatible with Managed Service for Prometheus and Managed Service for Grafana, eliminating the need to build your own monitoring systems and dashboards. After deploying applications in Knative, you can import monitoring data to Managed Service for Prometheus and view real-time metrics in Grafana.
Prerequisites
Knative is deployed in your cluster. For more information, see Deploy Knative.
Billing rules
After ingesting the Knative monitoring data to Managed Service for Prometheus, the corresponding components can automatically send monitoring metrics to Managed Service for Prometheus. These metrics are treated as custom metrics. Fees are charged for custom metrics.
Before you enable this feature, we recommend that you read Billing overview to understand the billing rules of custom metrics. The fees may vary based on the cluster size and number of applications. You can follow the steps in View resource usage to monitor and manage resource usage.
Activate Managed Service for Prometheus
Log on to the ACK console. In the navigation pane on the left, click Clusters.
On the Clusters page, find the cluster you want and click its name. In the left-side navigation pane, choose .
On the Knative Components page, select the Monitoring Dashboards tab, and follow the on-screen instructions to enable Prometheus dashboards.
View the Knative dashboard
After activating Managed Service for Prometheus, you can view the monitoring data on the Monitoring Dashboards tab.
Category | Description |
Request data | In the Overview (average over the selected time range) section, view the following data:
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Response latency data | In the Response Time section, you can view the response latency data of Knative, including the P50, P90, P95, and P99 response latency. |
Request concurrency data | In the Autoscaler section, you can view detailed information about the request concurrency of Knative.
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Activator | In the Activator section, view the following Knative activator metrics:
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Resource usage | In the Resource Usages section, you can view the usage information of Knative resources, including CPUs and memory. |
View key service discovery metrics of Knative
You can view and validate Knative service metrics by selecting predefined metrics or writing custom PromQL queries.
Log on to the ARMS console. In the navigation pane on the left, click Integration Management.
On the Integration Management page, select a region from the navigation pane on the top. Click the tab, then click Knative in the Integrated Addons conlumn.
On the page that appears, click the Metrics Explorer tab to view the Knative Service discovery metrics.
For detailed steps, see Metric exploration.
When the number of pods for a Knative application is scaled to zero, metrics such as the request concurrency and the number of requests sent to a pod per second cannot be collected by Managed Service for Prometheus. You can view these metrics in the console only after you access the pods of the Knative application.
When the number of pods for a Knative application is not zero, you can directly view the metrics in the console, such as the request concurrency and the number of requests sent to a pod per second. You do not need to access the pods of the Knative application.
Metric | Description |
queue_average_concurrent_requests | The number of concurrent requests sent to a pod. |
queue_requests_per_second | The number of requests sent to a pod per second. |
revision_request_latencies | The response latency. |
revision_request_count | The number of revision requests. |
References
To use Simple Log Service for log collection, monitoring and alerting. For more information, see Enable SLS on Knative and Configure alerting for Knative Services.