Funny you should mention that. :) I work at Google on PerfKit Benchmarker (https://github.com/GoogleCloudPlatform/PerfKitBenchmarker). Not only can you measure and test GCP (and other clouds), but we're trying to make it very easy for you to do so!
(PKB doesn't have a benchmark for App Engine yet, though. Sorry.)
Funny you should mention that. :) I work at Google on PerfKit Benchmarker (https://github.com/GoogleCloudPlatform/PerfKitBenchmarker). Not only can you measure and test GCP (and other clouds), but we're trying to make it very easy for you to do so!
(PKB doesn't have a benchmark for App Engine yet, though. Sorry.)