This is the PR for the freelist improvement from that alibaba article:
https://github.com/etcd-io/bbolt/pull/141Just to be clear, we are talking about this item from the post-mortem right?
> We are working closely with HashiCorp to deploy a new version of Consul that replaces BoltDB with a successor called bbolt that does not have the same issue with unbounded freelist growth.
EDIT: I see what you mean. The freelist improvement has to be enabled by setting the `FreelistType` config to "hashmap" (default is "array"). Indeed it doesn't look like consul has done that...