feat: databend-meta adds more metrics about raft-log #16884
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- "raft_log_cache_items" : number of items in raft log cache; - "raft_log_cache_used_size" : size of used space in raft log cache; - "raft_log_wal_open_chunk_size" : size of open chunk in raft log wal; - "raft_log_wal_offset" : global offset of raft log WAL; - "raft_log_wal_closed_chunk_count" : number of closed chunks in raft log WAL; - "raft_log_wal_closed_chunk_total_size" : total size of closed chunks in raft log WAL; Example output of these new metrics: ```text metasrv_server_raft_log_cache_items 35496 metasrv_server_raft_log_cache_used_size 659024620 metasrv_server_raft_log_wal_open_chunk_size 803 metasrv_server_raft_log_wal_offset 3536913654 metasrv_server_raft_log_wal_closed_chunk_count 3 metasrv_server_raft_log_wal_closed_chunk_total_size 584045971 metasrv_server_raft_log_size 584046774 ```
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Summary
feat: databend-meta adds more metrics about raft-log
Example output of these new metrics:
Tests
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