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Currently he gossiper marks endpoint_state objects as alive/dead. I some cases the endpoint_state::is_alive function is checked but in many other cases gossiper::is_alive(endpoint) is used to determine if the endpoint is alive. This series removed the endpoint_state::is_alive state and moves all the logic to gossiper::is_alive that bases its decision on the endpoint having an endpoint_state and being in the _live_endpoints set. For that, the _live_endpoints is made sure to be replicated to all shards when changed and the endpoint_state changes are serialized under lock_endpoint, and also making sure that the endpoint_state in the _endpoint_states_map is never updated in place, but rather a temporary copy is changed and then safely replicated using gossiper::replicate Refs https://github.com/scylladb/scylladb/issues/14794 Closes #14801 * github.com:scylladb/scylladb: gossiper: mark_alive: remove local_state param endpoint_state: get rid of _is_alive member and methods gossiper: is_alive: use _live_endpoints gossiper: evict_from_membership: erase endpoint from _live_endpoints gossiper: replicate_live_endpoints_on_change: use _live_endpoints_version to detect change gossiper: run: no need to replicate live_endpoints gossiper: fold update_live_endpoints_version into replicate_live_endpoints_on_change gossiper: add mutate_live_and_unreachable_endpoints gossiper: reset_endpoint_state_map: clear also shadow endpoint sets gossiper: reset_endpoint_state_map: clear live/unreachable endpoints on all shards gossiper: functions that change _live_endpoints must be called on shard 0 gossiper: add lock_endpoint_update_semaphore gossiper: make _live_endpoints an unordered_set endpoint_state: use gossiper::is_alive externally