Setting up DynamoDB

DynamoDB holds all the state that AlertManager keeps. The state is required to implement:

Acknowledgements: mark an alert as having been handled.
Alarm suppression: if alert is not yet acknowledged as handled, the same alert should not be sent twice.
Rate limiting: if too many alarms are triggering, do not overwhelm operations' inboxes & phone with alerts.

Create table

Create table:

Name = alertmanager_alerts
Primary key = alert_key (type=string)
Use default settings
[ Create ]

Enable stream

Now we need to enable stream for that table, so our Lambda function can listen to changes in this table.

From alertmanager_alerts > Overview > Stream details > Manage stream:

View type = New image
[ Enable ]