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"me" sstable format includes an important feature of storing the `host_id` of the local node when writing sstables. The is crucial for validating the sstable's `replay_position` in stats metadata as it is valid only on the originating node and shard (#10080), therefor we would like to make the `me` format mandatory. before making `me` mandatory, we need to stop handling `sstable_format` option if it is "md". in this change - gms/feature_service: do not disable `ME_SSTABLE_FORMAT` even if `sstable_format` is configured with "md". and in that case, instead, a warning is printed in the logging message to note that this setting is not valid anymore. - docs/architecture/sstable: note that "me" is used by default now. after this change, "sstable_format" will only accept "me" if it's explicitly configured. and when a server with this change joins a cluster, it uses "md" if the any of the node in the cluster still has `sstable_format`. practically, this change makes "me" mandatory in a 6.x cluster, assuming this change will be included in 6.x releases. Fixes #16551 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
