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* refactor: use downgrading the region instead of closing region * feat: enhance the tests for alive keeper * feat: add a metric to track region lease expired * chore: apply suggestions from CR * chore: enable logging for test_distributed_handle_ddl_request * refactor: simplify lease keeper * feat: add metrics for lease keeper * chore: apply suggestions from CR * chore: apply suggestions from CR * chore: apply suggestions from CR * refactor: move OpeningRegionKeeper to common_meta * feat: register operating regions to MemoryRegionKeeper