Create notifications for metrics alerts

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• Email
• Slack
• Discord
• Microsoft teams

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HIG-4625 Create notifications for metrics alerts

[greptile-apps]

To implement notifications for metric alerts, follow these steps:

1. Metric Monitor Job: Utilize backend/jobs/metric-monitor/metric-monitor.go to trigger alerts. Modify processMetricMonitors to include a new case for metric alerts.
2. Alert Payloads: Define or extend metric alert payloads in /backend/model/model.go, ensuring they include necessary metric data.
3. Discord Integration: In /backend/alerts/integrations/discord/messages.go, add a new method SendMetricMonitorAlert to format and send the metric alert using newMessageEmbed.
4. Microsoft Teams Integration: Extend /backend/alerts/integrations/microsoft-teams/bot_messages.go with a method like SendMetricMonitorAlert that constructs and sends an adaptive card for the metric alert.
5. Webhook Integration: In /backend/alerts/integrations/webhook/webhook.go, implement a new function SendMetricMonitorAlert to serialize the metric alert payload and send it to the specified webhook URL.

These steps provide a comprehensive approach to integrating metric alerts across various notification channels.

References

/backend/alerts/integrations/discord/messages.go
/backend/alerts/integrations/microsoft-teams/bot_messages.go
/backend/alerts/integrations/webhook/webhook.go
/backend/temp-alerts/temp-alerts.go
/backend/jobs/metric-monitor/metric-monitor.go
/backend/model/model.go

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