"It works" and "it's ready" are different claims. Integrations rarely fail on launch day; they fail in week six, when the token expires and someone adds a field. A readiness checklist for Salesforce AWS integrations, with a pass test on every item.
AppFlow won the spreadsheet at two integrations. Eighteen months and forty flows later it's a line item that gets mentioned in the monthly review. These three options aren't three prices, they're three cost shapes, and the crossover is the whole decision.
The error count was zero every day for three weeks. So was the invocation count. A stopped integration and a healthy one produce identical graphs, and every CloudWatch default is tuned to stay quiet when data stops arriving. Four signals worth emitting, and the alarm config that actually fires.
"EC2 – Other" is the third largest line on the bill and you run no EC2 instances. That's NAT gateway charges from a pipeline that is entirely Lambda, S3 and Athena. Five levers for cutting the AWS cost of Salesforce data pipelines, in the order worth pulling them.