How to configure monitoring rules in Prometheus?

To set up monitoring rules, you can use Prometheus’ rule configuration file. Here is a simple example:

1. Create a new rule configuration file, such as rules.yml.
2. Define your monitoring rules in the rule configuration file. For example, you can define a rule to monitor if the CPU usage exceeds a certain threshold.

groups:
- name: example-rules
  rules:
  - alert: HighCpuUsage
    expr: node_cpu_seconds_total{mode="idle"} / node_cpu_seconds_total{mode="system"} > 0.8
    for: 5m
    labels:
      severity: critical
    annotations:
      summary: High CPU usage on {{ $labels.instance }}
      description: CPU usage is above 80% for the last 5 minutes

1. Add the rules configuration file to the Prometheus configuration file. Include the following line in the prometheus.yml file:

rule_files:
  - "rules.yml"

1. Restart the Prometheus service to load the new rule configuration file.
2. View monitoring rules in the Prometheus Web interface and ensure that they are working as expected.

By using similar methods, you can define other monitoring rules to monitor various metrics and set different levels of alerts. Hope this can assist you in configuring monitoring rules in Prometheus.