Monitoring

Metrics of your application

Once your hello-world application is ready, use the following command to get application monitoring information:

hln metrics hello-world

And the output looks like this:

Use this cridential to login the monitoring dashboards of hello-world:
  Username: admin
  Password: prom-operator

Application hello-world has 1 available dashboard(s):
NAME                       URL
Remix Application Metrics  http://grafana.h8r.site/d/AA_8_pu7k/remix-application-metrics

See the dashboards

Open the link of grafana dashboard in your favorite browser and login with the cridentials printed above.

This graph shows how many times your application has been visited. Now go to your hello-world application's homepage and refresh a lot of times to make some requests. Then go back to dashboard page, wait a minute and refresh it. You will see the steep slope in your dashboard, which is caused by the requests we just made.

Trigger an alert

Go to Requestbin and create a Request Bin. It's a webhook which we can send our alerts to.

Make a file with the name amcfg.yaml, paste the following content into that file.

amcfg.yaml

apiVersion: monitoring.coreos.com/v1alpha1
kind: AlertmanagerConfig
metadata:
  name: hln-config
  labels:
    alertmanagerConfig: hln
spec:
  route:
    receiver: 'hln-receiver'
  receivers:
  - name: 'hln-receiver'
    webhookConfigs:
    - url: <your_reuqestbin_url>

Switch the placeholder <your_requestbin_url> with the real url of your requestbin and run the following command:

kubectl apply -f amcfg.yaml

Now the requestbin is the notifications' receiver. We can trigger the alert and alertmanager will send notifications automatically. You can visit your application's error page to make a 500 error intentionally, which will trigger the alert rule created by hln stack.

Wait a minute and go back to your requestbin dashboard. You will receive a notification that the alert rule has been triggered.

Congrats. You have finished exploring the monitoring section.