head:
  keys:
    - :site_updated_at
    - :url
  options:
    expires_in: 300

header:
  keys:
    - :home_page
  options:
    expires_in: 300

footer:
  keys:
    - :create_petition_page
    - :open_petition_page
  options:
    expires_in: 300

home_page:
  keys:
    - :last_government_response_updated_at
    - :last_debate_outcome_updated_at
  options:
    expires_in: 300

local_petitions_page:
  keys:
    - :constituency
  options:
    expires_in: 300

all_local_petitions_page:
  keys:
    - :constituency
  options:
    expires_in: 300

petition:
  keys:
    - :petition
    - :reveal_response
    - :site_updated_at
  options:
    expires_in: 300

robots:
  keys:
    - :last_petition_created_at
  options:
    expires_in: 86400

head:
  keys:
    - :site_updated_at
    - :url
  options:
    expires_in: 300

header:
  keys:
    - :home_page
  options:
    expires_in: 300

footer:
  keys:
    - :create_petition_page
    - :open_petition_page
  options:
    expires_in: 300

home_page:
  keys:
    - :site_updated_at
    - :last_government_response_updated_at
    - :last_debate_outcome_updated_at
  options:
    expires_in: 300

local_petitions_page:
  keys:
    - :constituency
  options:
    expires_in: 300

all_local_petitions_page:
  keys:
    - :constituency
  options:
    expires_in: 300

petition:
  keys:
    - :petition
    - :reveal_response
    - :site_updated_at
  options:
    expires_in: 300

robots:
  keys:
    - :last_petition_created_at
  options:
    expires_in: 86400

Add site_updated_at to keys for home_page fragment
Add site_updated_at to keys for home_page fragment

Without this the home page won't be updated immediately when we update the
Parliament model (whenever we save the Parliament model we touch Site).
