DevOps: How to configure AlertManager in Prometheus?

1global:
2  resolve_timeout: 5m
3
4route:
5  receiver: "slack-default"
6  group_by: ["alertname", "severity"]
7  group_wait: 30s
8  group_interval: 5m
9  repeat_interval: 4h
10  routes:
11    - match:
12        severity: critical
13      receiver: "pagerduty-critical"
14      group_wait: 10s
15      repeat_interval: 1h
16    - match:
17        severity: warning
18      receiver: "slack-warning"
19
20receivers:
21  - name: "slack-default"
22    slack_configs:
23      - api_url: "https://hooks.slack.com/services/T00/B00/xxx"
24        channel: "#alerts"
25        title: "{{ .GroupLabels.alertname }}"
26
27  - name: "pagerduty-critical"
28    pagerduty_configs:
29      - service_key: "xxx"
30        severity: "critical"
31
32  - name: "email"
33    email_configs:
34      - to: "team@mycompany.com"
35        subject: "{{ .GroupLabels.alertname }}"
36
37inhibit_rules:
38  - source_match:
39      severity: critical
40    target_match:
41      severity: warning
42    equal: ["alertname", "instance"]