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Watch a metric against a threshold and act: notify via SNS, trigger Auto Scaling, or invoke automation. States: OK, ALARM, INSUFFICIENT_DATA.
Records API activity (who did what, when, from where) for audit, security, and compliance. Different from CloudWatch's performance focus.
Capture metadata about IP traffic to/from network interfaces in a VPC — used for troubleshooting connectivity and security analysis.
A serverless event bus that routes events from AWS services and apps to targets (Lambda, SNS, etc.) using rules — enables event-driven automation.
ALB (Layer 7, HTTP/S, content-based routing), NLB (Layer 4, TCP/UDP, ultra-low latency, static IP), and Gateway LB (third-party appliances).
Maintains the desired number of instances by adding/removing capacity based on demand metrics and a min/desired/max configuration.
Target tracking (keep a metric at a target, e.g. 50% CPU), step scaling (adjust by steps as a threshold is breached), and scheduled scaling (predictable load).
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