Remove #alerts channel Alertmanager integrations
The #alerts channel in Slack is effectively `/dev/null` for notifications. We need to develop a plan for addressing alerts that are configured to spam this channel. _How do we?_ - Determine which alerts can be safely removed? - Determine which alerts should be directed elsewhere? - Determine which alerts are captured with Service Metrics Catalogue? ## Definition of Done - [ ] The #alerts channel is silent from Alertmanager - [ ] The #alerts channel is archived
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