Configuring Prometheus and Grafana

Table of Contents

Prometheus Configuration Instructions
Grafana Configuration Instructions

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The Optimizer Hub components are already configured to expose key metrics for scraping by Prometheus. But to be able to monitor this info in a Grafana dashboard, some additional configuration is required.

In your production systems, you likely want to use your existing Prometheus and Grafana instances to monitor Optimizer Hub. If you are just evaluating Optimizer Hub, you may want to install a separate instance of Prometheus and Grafana to just monitor your test instance of Optimizer Hub.

Note	Monitoring Optimizer Hub assumes you have a Prometheus and Grafana available, or install one within your Kubernetes cluster.

Prometheus Configuration Instructions

Optimizer Hub components expose their metrics on HTTP endpoints in a format compatible with Prometheus. Annotations are in place in the Helm chart with the details of the endpoint for every component. For example:

 annotations:
    prometheus.io/scrape: "true"
    prometheus.io/port: "8080"
    prometheus.io/path: "/q/metrics"

The following snippet is an example for the Prometheus configuration to scrape the metrics based on the above annotations:

 # Example scrape config for pods
#
# The relabeling allows the actual pod scrape endpoint to be configured via the
# following annotations:
#
# * `prometheus.io/scrape`: Only scrape pods that have a value of `true`
# * `prometheus.io/path`: If the metrics path is not `/metrics` override this.
# * `prometheus.io/port`: Scrape the pod on the indicated port instead of the
# pod's declared ports (default is a port-free target if none are declared).
- job_name: 'kubernetes-pods'
  kubernetes_sd_configs:
  - role: pod

  relabel_configs:
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
    action: keep
    regex: true
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
    action: replace
    target_label: __metrics_path__
    regex: (.+)
  - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
    action: replace
    regex: ([^:]+)(?::\d+)?;(\d+)
    replacement: $1:$2
    target_label: __address__
  # mapping of labels, this handles the `app` label
  - action: labelmap
    regex: __meta_kubernetes_pod_label_(.+)
  - source_labels: [__meta_kubernetes_namespace]
    action: replace
    target_label: kubernetes_namespace
  - source_labels: [__meta_kubernetes_pod_name]
    action: replace
    target_label: kubernetes_pod_name
  metric_relabel_configs:
  - source_labels:
      - namespace
    action: replace
    regex: (.+)
    target_label: kubernetes_namespace

Grafana Configuration Instructions

Once Prometheus is available and collection data from the Optimizer Hub Components, a dashboard can be added. You can find a Grafana configuration file cnc_dashboard.json in opthub-install-1.10.0.zip.

This dashboard expects the following labels to be attached to all application metrics, refering to the Prometheus configuration above:

cluster_id: The identifier of the Kubernetes cluster on which Optimizer Hub is installed. This allows you to switch between Optimizer Hub instances in different clusters.
kubernetes_namespace: The Kubernetes namespace on which Optimizer Hub is installed. This setting allows you to switch between Optimizer Hub instances in different namespaces of the same cluster.
kubernetes_pod_name: The Kubernetes pod name.
app: The value of the app label on the pod, which is provided by the labelmap action from the example Prometheus configuration mentioned below.

You need to manually edit the dashboard file if these labels are named differently in your environment.

The dashboard also relies on some infrastructure metrics from Kubernetes and cAdvisor, such as kube_pod_container_resource_requests and container_cpu_usage_seconds_total.