emqx4.3/changes/ce/breaking-13248.en.md

builtin durable storage backend has been replaced with the following two backends:

• builtin_local: A durable storage backend that doesn't support replication. It can't be used in a multi-node cluster. This backend is available in both open source and enterprise editions.
• builtin_raft: A durable storage backend that uses Raft algorithm for replication. This backend is available only in the enterprise edition.

The following Prometheus metrics have been renamed:

• emqx_ds_egress_batches -> emqx_ds_buffer_batches
• emqx_ds_egress_batches_retry -> emqx_ds_buffer_batches_retry
• emqx_ds_egress_batches_failed -> emqx_ds_buffer_batches_failed
• emqx_ds_egress_messages -> emqx_ds_buffer_messages
• emqx_ds_egress_bytes -> emqx_ds_buffer_bytes
• emqx_ds_egress_flush_time -> emqx_ds_buffer_flush_time