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app-metrics.md

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Application Metrics

Application Metrics are the indicators used to evaluate the performance and efficiency of your application. It can be enabled in the Devtron platform to see your application's metrics.

Types of Metrics available in the Devtron platform:

  1. CPU usage: Overall CPU utilization per pod and aggregated.
  2. Memory Usage: Overall memory utilization per pod and aggregated.
  3. Throughput: Number of requests processed per minute.
  4. Latency: Delay between request and response, measured in percentiles.

Setup Application Metrics

  1. Install Grafana Dashboard:

    To use the Grafana dashboard, you need to first install the integration from the Devtron Stack Manager.

    Read Grafana Dashboard

  2. Install Prometheus:

    Go to the Chart Store and search for prometheus. Use the Prometheus community's kube-prometheus-stack chart to deploy Prometheus.

    Figure 1: Chart Store

    After selecting the chart, configure these values as needed before deployment.

    kube-state-metrics: 
  metricLabelsAllowlist:   
  - pods=[*]

    Search for the above parameters, and update them as shown (or customize as needed).

    Figure 2: Prometheus Chart

  3. Enable upgradeJob paramter to install CRDs:

    Since Helm does not automatically apply CRDs, you need to enable the upgradeJob parameter in the Helm chart to ensure CRDs are applied before deploying Prometheus.

    • In the Prometheus Helm chart settings, locate the upgradeJob parameter and set it to true if it is false.

      Figure 3: upgradeJob Parameter

      After enabling the parameter, click Deploy Chart.

  4. Setup Prometheus Endpoint:

    Once Prometheus is installed, go to its App Details and navigate to Networking → Service in the K8s resources. Expand the Prometheus server service to see the endpoints.

    Copy the URL of the kube-prometheus service as shown in the image below.

    Figure 4: Prometheus Service

    To set Prometheus as a data source in Grafana, navigate to Global Configurations → Clusters & Environments, select your cluster, and edit its settings.

    Figure 5: Clusters and Environments

    Now to set up the Prometheus endpoint:

    • Enable the See metrics for applications in this cluster option, as shown in the image below.

    • Paste the copied URL into the Prometheus endpoint field, ensuring it includes http://

    • Click Update Cluster to save the changes.

      Figure 6: Prometheus Endpoint

    After adding the endpoint, application metrics will be visible in the Devtron dashboard for all the Devtron apps in the cluster. This includes CPU usage and Memory usage.

    Figure 7: CPU Usage & Memory Usage

  5. Enable Application Metrics:

    To enable Throughput and Latency metrics in Devtron, follow these steps:

    • Open your Devtron app.
    • Go to Configurations → Base Configurations → Deployment Template.
    • Enable Application Metrics in the Deployment Template as shown below and save the changes.

    Figure 8: Enable Application Metrics

    Now, you can track all your application metrics by navigating to Applications and going to the App Details page of your Devtron App as shown below.

    Figure 9: Application Metrics

{% hint style="warning" %}

Note

Enable metrics option is only available for Devtron charts and not for Custom Deployment Charts. {% endhint %}