Configure monitoring and notifications for individual services

To configure monitoring and notifications for individual services in a Kubernetes cluster, you can use the following approach with Prometheus and Alertmanager:

1.Annotate or label the specific services you want to monitor in your Kubernetes cluster. This will help you differentiate between the services you want to target.

For example, you can add an annotation or label to your Kubernetes deployment or pod:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-service
  labels:
    app: my-service
    custom-monitoring: "true"

Configure Prometheus to scrape metrics only from the services with the specified label. You can do this by modifying the kubernetes_sd_configs in your prometheus.yml configuration file:

scrape_configs:
- job_name: 'kubernetes-pods'
  kubernetes_sd_configs:
  - role: pod
  relabel_configs:
  - source_labels: [__meta_kubernetes_pod_label_custom_monitoring]
    action: keep
    regex: "true"
  # ... other configurations

This configuration will make Prometheus scrape metrics only from the pods with the label custom-monitoring: "true".

3. Create custom alert rules in Prometheus to target the specific services you want to monitor. You can do this by using the expr field in the alert.rules.yml configuration file to filter alerts based on the labels you’ve set:

groups:
- name: example
  rules:
  - alert: MyServiceDown
    expr: up{app="my-service"} == 0
    for: 1m
    labels:
      severity: critical
    annotations:
      summary: "My Service is down"
      description: "My Service is down for more than 1 minute."

4. Configure Alertmanager to send notifications based on the alert rules you’ve defined. You can set up receivers for each service or group of services, and route the alerts accordingly.

For example, you can add a new receiver for your specific service in the alertmanager.yml configuration file:

route:
  receiver: 'default-receiver'
  routes:
  - match:
      alertname: MyServiceDown
    receiver: 'my-service-receiver'
receivers:
- name: 'default-receiver'
  # ... default receiver configuration
- name: 'my-service-receiver'
  webhook_configs:
  - url: 'https://my-service-webhook-url.example.com'
    send_resolved: true

This configuration will send notifications to the specified webhook URL when the MyServiceDown alert is triggered.

By following these steps, you can set up custom monitoring and notifications for individual services in your Kubernetes cluster. Adjust the configurations and labels according to your specific needs.