Test health monitor:
https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/testDetails?testName=cheets_VellamoTest

Root cause:
In cheets_VellamoTest.py, the following line always returns true:
if arc.get_sdk_version() >= 28:

It's because arc.get_sdk_version() returns a string, and '25' >= 28 evaluates to true in python.

It should use arc.get_android_sdk_version() instead.