monitoring.api.v3.api-client.custom_metric_test: test_custom_metric failed

[flaky-bot]

Note: #8337 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: f34f89b
buildURL: Build Status, Sponge
status: failed

Test output

Traceback (most recent call last):
  File "/workspace/monitoring/api/v3/api-client/custom_metric_test.py", line 77, in custom_metric
    assert custom_metric
AssertionError: assert None

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

---

When run at the same commit (f34f89b), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).

[dandhlee]

Seems transient, closing for now.