I think your strategy for testing APIs hosted in Apigee Edge is not different than the appropriate strategy for testing APIs hosted anywhere else. I don't think there is special documentation in this regard. Just invoke the APIs using the appropriate dynamic request content.
As for test execution:
- use a suitable warmup period. Caches get filled, pages get filled.
- vary connection times and payload sizes to model expected real-world transactions
- try to model the number of API keys or tokens - you cannot run an effective test using only a single token if your real-world client base will use 5000 concurrent tokens.
- run small tests for at least 10 minutes
- conduct many different trials
- run at least one long soak test - 48 hours or so
I also don't have any guidance for you in comparing tests implemented in JMeter versus tests implemented in LoadRunner. That seems like it ought to be simple to do, though, once you have the tests implemented. Building the tests is the hard part; comparing the results will be easy.
good luck
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