All these imports are bad: http://shortn/_fwKm4njUgB

This is especially bad becauese the chromite/third_party path is setup by magic when something from chromite is imported. This means that in all of the cases above, the import order of modules is significant.
 
Wrap infra_libs.ts_mon.FieldTypes into metrics.FieldTypes so that external users can use it from there. That's the only reason I know we're imported this module.