How do I enable multi-tenant Alertmanager configs in Kubernetes clusters?

In this guide, we will set up multi-tenant Alertmanager configurations in a Kubernetes cluster using Pulumi. We will create Kubernetes namespaces for different tenants and deploy separate Alertmanager instances for each tenant. This setup allows each tenant to have its own Alertmanager configuration and manage alerts independently.

import * as pulumi from "@pulumi/pulumi";
import * as k8s from "@pulumi/kubernetes";

// Define the tenants
const tenants = ["tenant1", "tenant2", "tenant3"];

// Create a namespace and deploy Alertmanager for each tenant
tenants.forEach(tenant => {
    // Create a namespace for the tenant
    const namespace = new k8s.core.v1.Namespace(tenant, {
        metadata: {
            name: tenant
        }
    });

    // Create a ConfigMap for Alertmanager configuration
    const alertmanagerConfig = new k8s.core.v1.ConfigMap(`${tenant}-alertmanager-config`, {
        metadata: {
            namespace: namespace.metadata.name,
            name: "alertmanager-config"
        },
        data: {
            "alertmanager.yaml": `
                global:
                  resolve_timeout: 5m
                route:
                  group_by: ['alertname']
                  group_wait: 30s
                  group_interval: 5m
                  repeat_interval: 12h
                  receiver: 'default'
                receivers:
                - name: 'default'
                  email_configs:
                  - to: 'alerts@example.com'
            `
        }
    });

    // Deploy Alertmanager for the tenant
    const alertmanagerDeployment = new k8s.apps.v1.Deployment(`${tenant}-alertmanager`, {
        metadata: {
            namespace: namespace.metadata.name,
            name: "alertmanager"
        },
        spec: {
            replicas: 1,
            selector: {
                matchLabels: {
                    app: "alertmanager"
                }
            },
            template: {
                metadata: {
                    labels: {
                        app: "alertmanager"
                    }
                },
                spec: {
                    containers: [{
                        name: "alertmanager",
                        image: "prom/alertmanager:v0.21.0",
                        args: ["--config.file=/etc/alertmanager/alertmanager.yaml"],
                        volumeMounts: [{
                            name: "config-volume",
                            mountPath: "/etc/alertmanager"
                        }]
                    }],
                    volumes: [{
                        name: "config-volume",
                        configMap: {
                            name: "alertmanager-config"
                        }
                    }]
                }
            }
        }
    });

    // Expose Alertmanager service
    const alertmanagerService = new k8s.core.v1.Service(`${tenant}-alertmanager-service`, {
        metadata: {
            namespace: namespace.metadata.name,
            name: "alertmanager"
        },
        spec: {
            selector: {
                app: "alertmanager"
            },
            ports: [{
                port: 9093,
                targetPort: 9093
            }]
        }
    });
});

Key Points:

We defined multiple tenants and created a namespace for each tenant.
We created a ConfigMap for each tenant to hold the Alertmanager configuration.
We deployed an Alertmanager instance for each tenant using a Kubernetes Deployment.
We exposed each Alertmanager instance as a Kubernetes Service.

Summary:

In this guide, we set up multi-tenant Alertmanager configurations in a Kubernetes cluster using Pulumi. We created separate namespaces, ConfigMaps, Deployments, and Services for each tenant, allowing each tenant to have its own Alertmanager instance and configuration. This setup enables independent alert management for multiple tenants within the same Kubernetes cluster.

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