+#
+# apt_update_frequency - *string* Supported values:
+# **always**: Will fire `apt-get update` at every puppet run. Intended to
+# deprecate the `always_apt_update` parameter.
+# **daily**: Trigger `apt-get update` if the value of the fact
+# `apt_update_last_success` is less than current epoch time - 86400.
+# *notifying the apt_update exec will trigger apt-get update regardless*
+# **weekly**: Trigger `apt-get update` if the value of the fact
+# `apt_update_last_success` is less than current epoch time - 604800.
+# *notifying the apt_update exec will trigger apt-get update regardless*
+# **reluctantly**: *Default* only run apt-get update if the exec resource `apt_update` is notified.
+#