def METHOD_NAME(dir = ROOT_DIRECTORY):
  """Find all yaml tags in .go files from given directory."""
  go_tags = {}
  exclude_dirs = set(["bundle", "dependency", "charts"])
  for root, dirnames, filenames in os.walk(dir, topdown=True):
    dirnames[:] = [d for d in dirnames if d not in exclude_dirs]
    for filename in fnmatch.filter(filenames, "*.go"):
      file = root + "/" + filename
      fill_yaml_tags_from_file(go_tags, file)
  return go_tags