code: func setAnnotation(annotations *appctypes.Annotations, key, val string) {
  	if key != "" && val != "" {
  		annotations.Set(*appctypes.MustACIdentifier(key), val)
  	}
  }
docs: // setAnnotation sets the annotation entries associated with non-empty
  // key to the single non-empty value. It replaces any existing values
  // associated with key.