flink

[hotfix][task][network] Do not swallow exceptions from actions chained to the availability futures

[hotfix][test] Do not hide original exception in ShuffleCompressionITCase

[hotfix][task] Throw MailboxClosedException if TaskMailbox is closing instead of IllegalStateException

[FLINK-18662][docs][metrics] Update the metrics documentation to reflect current state.

[FLINK-18662][metrics] Expose persisted and processed bytes metrics to the REST and Web UI