You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: iam_user_identity.rb
    path of file: ./repos/vets-api/app/models
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'sentry_logging'

# Subclasses the `UserIdentity` model. Adds a unique redis namespace for IAM user identities.
# Like the it's
    
  def self.valid_mhv_id(id_from_profile)
    # TODO: For now, log instances of duplicate MHV ID.
    # See issue #19971 for consideration of whether to reject access
    # to features using this identifier if this happens.
    mhv_ids = (id_from_profile == 'NOT_FOUND' ? nil : id_from_profile)
    mhv_ids = mhv_ids&.split(',')&.uniq
    if mhv_ids&.size.to_i > 1
      log_message_to_sentry('OAuth: Multiple MHV IDs present', :warn, { mhv_ien: id_from_profile })
    end