#4237 BT metricscaler - Filter cpu query to get the metrics for the correct resources

[odedfos]

Description

Fixes #4237

Note: It's a good idea to open an issue first for discussion.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.6 (see Test Enviroment Setup)
• Lint pass: nox -s lint (see Test Enviroment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• Please merge this PR for me once it is approved.

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[odedfos]

@googlebot I signed it!

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[leahecole]

@GoogleCloudPlatform/bigtable-dpe for review

[leahecole]

Hey @odedfos - it looks like our CI/CD is failing with this error:

Traceback (most recent call last):
  File "/workspace/bigtable/metricscaler/metricscaler_test.py", line 45, in test_get_cpu_load
    assert float(get_cpu_load(BIGTABLE_INSTANCE, BIGTABLE_INSTANCE)) > 0.0
  File "/workspace/bigtable/metricscaler/metricscaler.py", line 49, in get_cpu_load
    cpu = next(cpu_query.iter())
StopIteration

Could you take a look and see how to resolve it?

[odedfos]

I've fixed the failing tests

[leahecole]

Hi @odedfos - sorry for delay. CI is passing, but lint is failing - I'll fix those lint errors for you and get this merged asap. Sorry for the delay! Thanks @billyjacobson for the review :)

[leahecole]

This 3.7 failure seems like a fluke - I'm rerunning to see what happens

[odedfos]

Thanks @leahecole for helping to get this in!