prometheus-alertmanager

The Alertmanager handles alerts sent by client applications such as the Prometheus server. The Prometheus Alertmanager Helm chart automates deployment and configuration of Alertmanager in Kubernetes clusters using Minimus images.

Prerequisites

A subscription to the Minimus images included in the chart
A running Kubernetes cluster (v1.25 or higher is recommended)
kubectl installed and configured
Helm v3.8 or higher for OCI support (Installation instructions)
Cluster Admin privileges
Persistent storage available in your cluster

Try It Out

In this example we will deploy Alertmanager on a Kubernetes cluster using the Minimus Prometheus Alertmanager Helm chart. Alertmanager will handle deduplication, grouping, and routing of alerts from Prometheus and other monitoring systems.

Step 1: Start Cluster

If you have a cluster to work with, skip this step. Otherwise, start a Minikube cluster. Deployment instructions

Step 2: Create Namespace

Create a namespace:

kubectl create ns prometheus-alertmanager

Step 3: Deploy the Helm Chart

Deploy the Minimus Helm chart:

helm install my-prometheus-alertmanager oci://helm.mini.dev/prometheus-alertmanager \
  --version 1.41.1 \
  -n prometheus-alertmanager \
  --wait

If you want to override the chart's defaults, go to the Values tab, save a copy locally with your changes. Deploy the chart with your overrides using -f values.yaml:

helm install my-prometheus-alertmanager oci://helm.mini.dev/prometheus-alertmanager \
  --version 1.41.1 \
  -f values.yaml \
  -n prometheus-alertmanager \
  --wait

Step 4: Verify Prometheus Alertmanager is Running

Confirm the chart deployed successfully and Alertmanager started:

kubectl get pods -n prometheus-alertmanager -l app.kubernetes.io/name=alertmanager

You should see output similar to:

NAME                                  READY   STATUS    RESTARTS   AGE
my-prometheus-alertmanager-0          1/1     Running   0          2m

Step 5: Test HTTP Endpoint

Port-forward to the Alertmanager service and verify it responds:

kubectl port-forward svc/my-prometheus-alertmanager -n prometheus-alertmanager 9093:9093

In a separate terminal, test the health endpoint:

curl -sf http://localhost:9093/-/healthy && echo "Alertmanager is healthy"

You should see:

Alertmanager is healthy

You can also check the Alertmanager API status:

curl -sf http://localhost:9093/api/v2/status | jq .cluster.status

Expected output:

"ready"

Step 6: Clean Up

Uninstall the chart and delete the namespace to remove all resources:

helm uninstall my-prometheus-alertmanager -n prometheus-alertmanager
kubectl delete namespace prometheus-alertmanager

Terms & Info

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Disclaimer

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