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Audit log data structures.

The audit log is logging that is produced by user actions and consumed by users in the form of the mz_catalog.mz_audit_events SQL table and by the cloud management layer for billing and introspection. This crate is designed to make the production and consumption of the logs type safe. Events and their metadata are versioned and the data structures replicated here so that if the data change in some other crate, a new version here can be made. This avoids needing to poke at the data when reading it to determine what it means and should have full backward compatibility. This is its own crate so that production and consumption can be in different processes and production is not allowed to specify private data structures unknown to the reader.



New version variants should be added if fields need to be added, changed, or removed.

Describes the environment’s storage usage at a point in time.