Research (and fix) state not found warning

[oxarbitrage]

We are recently seeing a warning in zebrad. We want to check it in more details and decide what to in the context of this ticket.

#8865 (comment)

2024-09-16T13:37:54.535314Z  WARN zebra_state::service::finalized_state::disk_db: could not canonicalize "/var/cache/zebrad-cache/state/v25/mainnet": No such file or directory (os error 2)

In regtest mode:

2024-09-19T11:59:37.538954Z  WARN zebra_state::service::finalized_state::disk_db: could not canonicalize "/tmp/testp3siw8dm/515/node0/state/v25/regtest": No such file or directory (os error 2)

[mpguerra]

Is this only in CI?

[arya2]

Is this only in CI?

No, I've seen it locally as well. I think it happens when creating a new empty state, or after the old major version has already been renamed and Zebra has restarted because there's no file there. We probably want it to be an info-level log instead, or check for a version file in the new major version before attempting to canonicalize the path to the old major version.