emqx/changes/ce/fix-11145.en.md

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Add several fixes and improvements in Ekka and Mria.
Ekka:
- improve cluster discovery log messages to consistently describe actual events
[Ekka PR](https://github.com/emqx/ekka/pull/204)
- remove deprecated cluster auto-clean configuration parameter (it has been moved to Mria)
[Ekka PR](https://github.com/emqx/ekka/pull/203)
Mria:
- ping only running replicant nodes. Previously, `mria_lb` was trying to ping both stopped and running
replicant nodes, which might result in timeout errors.
[Mria PR](https://github.com/emqx/mria/pull/146)
- use `null_copies` storage when copying `$mria_rlog_sync` table.
This fix has no effect on EMQX for now, as `$mria_rlog_sync` is only used in `mria:sync_transaction/2,3,4`,
which is not utilized by EMQX.
[Mria PR](https://github.com/emqx/mria/pull/144)