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Cache Management improvements

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@garden-gnome garden-gnome released this 13 Oct 16:06

This release...

  1. ...changes the way we do cache management (previously called graph cleanup):
    • Cache is now considered only the set of image layers that are not currently used.
    • Dropped grootfs.graph_cleanup_threshold_in_mb BOSH property.
    • Added grootfs.cache_size_bytes instead.
    • If you are currently setting grootfs.graph_cleanup_threshold_in_mb to any value but 0, we recommend converting that value to bytes and providing it to grootfs.cache_size_bytes instead.
  2. ...emits new cache management related metric: grootfs.UnusedLayersSize.