Vus per pod

[lukeoguro]

This ended up being a bit of an overloaded PR, but the main change is to:

• Change the --path flag to --file for edamame run so its closer to the kubectl convention
• Allow a --vus-per-pod/-v flag to customize the number of VUs per pod.

To test this, run a test script with and without the flag. kubectl get nodes and kubectl get pods -o wide should show you how the number of nodes will change with the flag. After the test finishes, make sure the nodes are scaled back down to 0.

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The other major change is I've performance-tuned statsite to handle up to 2 million metrics a second. There may be some issues with the availability of m5zn.xlarge instances, which in that case, you can manually change the value to m5.xlarge in the statsite_nodegroup_template.yaml file.

Resolves #97; Resolves #36; Resolves #90

[gcpinckert]

I'm still getting that address not found error when running a test:

--> edamame run --file ./k6_tests/test1.js                                                                               18:54:52  羽22m 30.212s
[06:55:42:378] ℹ Reading test script...
[06:55:42:381] ✔ Successfully read test script.
[06:55:42:381] ℹ Initializing load test with 1 load generator (5000 VUs per pod)...
[06:55:43:997] ✖ Error running test: Error: getaddrinfo ENOTFOUND a90b4e77762a244709151e2cbadc4523-982894087.us-west-2.elb.amazonaws.com

This is a new cluster, and I've switched to the m5.xlarge type to avoid conflicts with availability zones

The test appears to work if I try to run a second time, so I think this is just a timing issue for the external service.

[lukeoguro]

Thanks for testing Ginni! I believe this stems from running tests too quickly after edamame init — we might want to add a polling measure to make sure the DB API service is ready before saying "welcome to Edamame".

[gcpinckert]

Yeah I figured it might other than the changed code here.

I took a quick testing break to eat, but I'll get back on it here in a few and if everything is above board will get things merged! 🙌

[gcpinckert]

Everything looks good to me! Nice work!!