X_LIVE_REPLICA_IDENTITY
Means
a replicated table has no replica identity
Typical cause
an entity table with no primary key under REPLICA IDENTITY DEFAULT, or with REPLICA IDENTITY NOTHING: once published, Postgres refuses its UPDATE and DELETE and a change cannot be keyed. A table with a primary key is never named (22.1.0; until then every non-FULL table was, on every boot). Warned at preflight, never thrown
Fix
ALTER TABLE <t> REPLICA IDENTITY FULL; or a primary key — one per table the warning names; rows already in the WAL keep the identity they were written with