Liveness Probe

Always 200 with ok: true while the process is answering. ok is liveness and never depends on lite: a process whose Lite dataset failed to load is still alive and still serves every other endpoint, and reporting that in the status code would stop a container from ever becoming healthy. When lite.loaded is false every LITE lookup on this process answers 503 lite_db_unavailable, and lite.datasetUpdatedAt is null.