Briven/infra/observability/alertmanager/alertmanager.yml

# briven alertmanager config — routes prometheus alerts to discord.
#
# we use the benjojo/alertmanager-discord bridge as a sidecar because
# alertmanager's webhook_configs posts a prometheus-shaped JSON that
# discord doesn't understand. the bridge translates one format into the
# other and posts to the discord webhook URL — see compose.yml.
#
# two routes:
#   severity=critical|warning  →  #briven-alerts (pageable)
#   everything else (info)     →  #briven-deploys (info stream)
#
# both bridge instances run as separate services so each can hold a
# different DISCORD_WEBHOOK env. alertmanager itself only knows about
# the two http://… endpoints inside the docker network.

global:
  resolve_timeout: 5m

route:
  group_by: ['alertname', 'service']
  group_wait: 30s
  group_interval: 5m
  # Re-fire every 4h while still firing — avoids alert fatigue but keeps
  # the page warm if someone missed the first ping.
  repeat_interval: 4h
  receiver: deploys
  routes:
    - matchers:
        - severity =~ "critical|warning"
      receiver: alerts
      continue: false

receivers:
  - name: alerts
    webhook_configs:
      - url: 'http://alertmanager-discord-alerts:9094/'
        send_resolved: true

  - name: deploys
    webhook_configs:
      - url: 'http://alertmanager-discord-deploys:9094/'
        send_resolved: false

inhibit_rules:
  # If a critical fires for a service, suppress redundant warnings on
  # the same service for the same alertname.
  - source_matchers:
      - severity = critical
    target_matchers:
      - severity = warning
    equal: ['alertname', 'service']