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Add info about Step Function execution limits (#693)

This limit is not clearly documented and reduces the range of situations that it's appropriate to use Step Functions for iteration.
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hayfield 1 year ago
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      README.md

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@@ -1649,6 +1649,7 @@ Step Functions
### Step Functions Gotchas and Limitations
- Step Functions are free tier eligible up to an initial 4000 transitions per month. Thereafter, the charge is $0.025 per 1000 state transitions.
- You can have many, simultaneous, executions, but be aware of lambda throttling limits. This has been per-account, pre-region, but recently became settable per-lambda.
- Step Function executions are limited to 25,000 events. Each step creates multiple events. This means that [iterating a loop using Lambda](https://docs.aws.amazon.com/step-functions/latest/dg/tutorial-create-iterate-pattern-section.html) is limited to an iteration count of around 3000 before needing to [continue as a new execution](https://docs.aws.amazon.com/step-functions/latest/dg/tutorial-continue-new.html).

Route 53
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