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Chapter 3. Monitoring and logging Red Hat Developer Hub on Amazon Web Services (AWS)

You can configure Red Hat Developer Hub to use Amazon CloudWatch for real-time monitoring and Amazon Prometheus for comprehensive logging. This is convenient when hosting Developer Hub on Amazon Web Services (AWS) infrastructure.

3.1. Monitoring with Amazon Prometheus
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You can configure Red Hat Developer Hub to use Amazon Prometheus for comprehensive logging. Amazon Prometheus extracts data from pods that have specific pod annotations.

3.1.1. Prerequisites
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To enable logging to Amazon Prometheus, you can configure the required pod annotations by using the Red Hat Developer Hub Operator.

Procedure

  1. As an administrator of the Red Hat Developer Hub Operator, edit the default configuration to add Prometheus annotations as follows: 

    # Update OPERATOR_NS accordingly
$ OPERATOR_NS=rhdh-operator
$ kubectl edit configmap backstage-default-config -n "${OPERATOR_NS}"

  2. Find the deployment.yaml key in the config map and add the annotations to the spec.template.metadata.annotations field as follows: 

    deployment.yaml: |-
  apiVersion: apps/v1
  kind: Deployment
  # --- truncated ---
  spec:
    template:
      # --- truncated ---
      metadata:
        labels:
         rhdh.redhat.com/app:  # placeholder for 'backstage-<cr-name>'
        # --- truncated ---
        annotations:
          prometheus.io/scrape: 'true'
          prometheus.io/path: '/metrics'
          prometheus.io/port: '9464'
          prometheus.io/scheme: 'http'
  # --- truncated ---
  3. Save your changes.

Verification

To verify if the scraping works:

  1. Use kubectl to port-forward the Prometheus console to your local machine as follows: 

    $ kubectl --namespace=prometheus port-forward deploy/prometheus-server 9090
  2. Open your web browser and navigate to http://localhost:9090 to access the Prometheus console.
  3. Monitor relevant metrics, such as process_cpu_user_seconds_total.

To enable logging to Amazon Prometheus, you can configure the required pod annotations by using the Red Hat Developer Hub Helm chart.

Procedure

  • To annotate the backstage pod for monitoring, update your values.yaml file as follows: 

    upstream:
  backstage:
    # --- TRUNCATED ---
    podAnnotations:
      prometheus.io/scrape: 'true'
      prometheus.io/path: '/metrics'
      prometheus.io/port: '9464'
      prometheus.io/scheme: 'http'

Verification

To verify if the scraping works:

  1. Use kubectl to port-forward the Prometheus console to your local machine as follows: 

    kubectl --namespace=prometheus port-forward deploy/prometheus-server 9090
  2. Open your web browser and navigate to http://localhost:9090 to access the Prometheus console.
  3. Monitor relevant metrics, such as process_cpu_user_seconds_total.

3.2. Logging with Amazon CloudWatch
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Logging within the Red Hat Developer Hub relies on the Winston library.

3.2.1. Configuring the application log level by using the Red Hat Developer Hub Operator
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You can configure the application log level by using the Red Hat Developer Hub Operator.

Procedure

  • Modify the logging level by including the environment variable LOG_LEVEL in your custom resource as follows: 

    spec:
  # Other fields omitted
  application:
    extraEnvs:
      envs:
        - name: LOG_LEVEL
          value: debug

3.2.2. Configuring the application log level by using the Red Hat Developer Hub Helm chart
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You can configure the application log level by using the Red Hat Developer Hub Helm chart.

Procedure

  • Modify the logging level by adding the environment variable LOG_LEVEL to your Helm chart values.yaml file: 

    upstream:
  backstage:
    # --- Truncated ---
    extraEnvVars:
      - name: LOG_LEVEL
        value: debug

3.2.3. Retrieving logs from Amazon CloudWatch
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Prerequisites

  • CloudWatch Container Insights is used to capture logs and metrics for Amazon Elastic Kubernetes Service. For more information, see Logging for Amazon Elastic Kubernetes Service documentation.
  • To capture the logs and metrics, install the Amazon CloudWatch Observability EKS add-on in your cluster. Following the setup of Container Insights, you can access container logs using Logs Insights or Live Tail views.

  • CloudWatch names the log group where all container logs are consolidated in the following manner: 

    /aws/containerinsights/<cluster_name>/application

Procedure

  • To retrieve logs from the Developer Hub instance, run a query such as: 

    fields @timestamp, @message, kubernetes.container_name
| filter kubernetes.container_name in ["install-dynamic-plugins", "backstage-backend"]
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