[WIP] Raft: Add identifier to logger when wait index happens(release-6.1) (#8473)

[ti-chi-bot]

This is an automated cherry-pick of #8473

manual cherry-pick of #8446

What problem does this PR solve?

Issue Number: close #8448, close #8076

Problem Summary:

What is changed and how it works?

logging after this PR will print the "source=request_identifier" into logging, along with the index info and time elapsed

[2023/11/30 21:51:23.688 +08:00] [DEBUG] [LearnerReadWorker.cpp:317] ["[Learner Read] Batch read index, num_regions=1 num_requests=1 num_stale_read=0 num_cached_index=0 num_unavailable=0 cost=2ms"] [source="MPP<gather_id:1, query_ts:1701352283678367892, local_query_id:11, server_id:956, start_ts:445999293050388482,task_id:1>"] [thread_id=271]
[2023/11/30 21:51:30.827 +08:00] [INFO] [ReadIndex.cpp:100] ["[region_id=188005] wait learner index done, prev_index=8 curr_index=9 to_wait=9 elapsed_s=7.139 timeout_s=300.000"] [source="MPP<gather_id:1, query_ts:1701352283678367892, local_query_id:11, server_id:956, start_ts:445999293050388482,task_id:1>"] [thread_id=271]
[2023/11/30 21:51:30.827 +08:00] [DEBUG] [LearnerReadWorker.cpp:416] ["[Learner Read] Finish wait index and resolve locks, wait_cost=7139ms n_regions=1 n_unavailable=0"] [source="MPP<gather_id:1, query_ts:1701352283678367892, local_query_id:11, server_id:956, start_ts:445999293050388482,task_id:1>"] [thread_id=271]

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Fix the issue that the max-quantile metrics are displayed incorrectly on Grafana

[ti-chi-bot]

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