- Set alertmanager.enabled: true (was false)
- Add Slack receiver config pointing to gatus-slack-webhook secret URL
- Add alertmanagerSpec.secrets to mount gatus-slack-webhook into Alertmanager pod
- Route: group by alertname+namespace, 30s wait, 5m interval, 4h repeat
- Channel: #api-alerts with summary title and description text
Closesleeworks-agents/api-company#210