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celery_b1 will read from the old broker to drain all messages and write new messages to the new broker
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https://dimagi.atlassian.net/browse/SAAS-19087
Follows what was done in #6791, though that PR had a few more bumps along the way which should ideally now not impact this one.
This PR includes the terraform changes necessary to create a new elasticache cluster running redis, and a new r53 record to enable easy routing to the cluster.
It then handles updating the variables used by webworkers and celery processes to interact with the message broker, and then sets celery_broker_migration to true on celery_b1 indicating that celery_b1 should read messages from the OLD_BROKER_URL to ensure all messages are drained.
To roll this out, I'll first run terraform apply on eu to create the cluster. Once I confirm the cluster has been created successfully, I will follow the steps outlined in https://dimagi.atlassian.net/wiki/spaces/cc/pages/3522330836/Migrating+Celery+Brokers to perform the migration.
Environments Affected
EU