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I am checking logs in cloudwatch to see who last deployed to our EB instance and when. To do this, I am filtering the API Activity History by resource name.

In the list of actions I see {Register/Deregister}InstancesWithLoadBalancer events. Each has the name of the initiating user. Most are the names of users registered in IAM, but every so often there is a user with a system generated id in the form i-xxxxxxxx.

"who" is this user and what is happening to cause this event?

Synesso
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    That looks like an instance ID. I'd guess your instances have an IAM role - do your instances have a script to register/deregister themselves during deployments or something? – ceejayoz Apr 21 '16 at 20:50
  • Oh. That's it. Someone built it into a deploy pipeline of an unrelated app. Thank you. – Synesso Apr 21 '16 at 20:53

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