alertmanager.yml

global:
  # Slack Workspace API URL
  slack_api_url: 'https://hooks.slack.com/services/'

route:
  # Group Alerts by
  group_by: ['job']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 4h
  receiver: 'slack-notifications'

receivers:
  - name: 'slack-notifications'
    slack_configs:
    # Slack Channel Name in Workspace
    - channel: '#alerts'
      send_resolved: true
      icon_emoji: ':prometheus:'
      # Slack Notification Formatting
      title: '[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .CommonAnnotations.title }}'
      text: >-
        {{ range .Alerts }}
          *Alert:* `{{ .Labels.severity }}` {{ .Annotations.summary }}
          *Description:* {{ .Annotations.description }}
          *Graph:* <{{ .GeneratorURL }}|:chart_with_upwards_trend:>
          *Details:*
          {{ range .Labels.SortedPairs }} • *{{ .Name }}:* `{{ .Value }}`
          {{ end }}
        {{ end }}