emqx/changes/ce/feat-12781.en.md

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Added metrics related to EMQX durable storage to Prometheus.
New metrics:
- `emqx_ds_egress_batches`
- `emqx_ds_egress_batches_retry`
- `emqx_ds_egress_batches_failed`
- `emqx_ds_egress_messages`
- `emqx_ds_egress_bytes`
- `emqx_ds_egress_flush_time`
- `emqx_ds_store_batch_time`
- `emqx_ds_builtin_next_time`
- `emqx_ds_storage_bitfield_lts_counter_seek`
- `emqx_ds_storage_bitfield_lts_counter_next`
- `emqx_ds_storage_bitfield_lts_counter_collision`
Note: these metrics are only visible when session persistence is enabled.
Number of persisted messages has been also added to the dashboard.