Merge "Report optimized targets when nothing has to be built" into main

        build_targets.add(target)

        get_metrics_agent().report_unoptimized_target(target, 'Required build target.')

        continue

      # If nothing is discovered without error, that means nothing is needed.

      if not test_discovery_zip_regexes:

        get_metrics_agent().report_optimized_target(target)

        continue

      regex = r'\b(%s.*)\b' % re.escape(target)

      for opt in test_discovery_zip_regexes: