cache_key_genid is missing documentation

[LionsAd]

cache_key_genid is missing documentation, here is what I found out by analyzing the code:

This plugin allows you to use a Kyoto database to increase genid per hostname, hence expiring the cache for a full domain using the zero cost mechanism to set the genid in the cache key.

The additional overhead for the plugin is:

• Parse hostname from given url
• Check kyoto DB for genid for the given host [DB lookup]
• Set genid for the cache key dynamically

This plugin takes just one argument:

• The path to the genid kyoto DB

I presume GoDaddy uses this in combination with a purge plugin like remap_purge to write values to the Kyoto DB to expire whole domains.