disagg: Fix unexpected object storage usage caused by pre-lock residue (#10760)

[ti-chi-bot]

This is an automated cherry-pick of #10760

What problem does this PR solve?

Issue Number: close #10763

Problem Summary:

• In concurrent remote write paths, PageDirectory write-group semantics could cause follower writers to miss their own applied lock-id cleanup signals.
• As a result, S3LockLocalManager.pre_lock_keys could remain resident and be repeatedly written into manifest locks.
• S3GC then treated many obsolete objects as still protected, leading to long-term remote storage usage inflation.

What is changed and how it works?

disagg: eliminate pre-lock key residue that lead to unexpected OSS usage

• End-to-end correctness fixes for lock lifecycle

  • PageDirectory::apply now returns writer-scoped applied_data_files for both write-group owner and followers, so each writer gets its own cleanup signal.
  • UniversalPageStorage::write uses those per-writer ids to clean pre-locks reliably after apply.
  • Added explicit failure cleanup path: cleanPreLockKeysOnWriteFailure(...) is invoked when remote write/apply fails.
  • createS3LockForWriteBatch was adjusted to avoid partial pre-lock residue on partial lock-creation failures (append to pre_lock_keys after lock-creation pass), and its return value is now aligned with "newly appended keys" semantics.

• Test coverage and regression guards

  • Added write-group concurrency tests in PageDirectory and UniversalPageStorage paths.
  • Added focused S3LockLocalManager tests for partial cleanup, failure cleanup, lock-return semantics, and partial-failure atomicity.
  • Updated SyncPoint-based async tests to use std::launch::async to avoid deferred scheduling risk.

• Observability and operations improvements

  • Most observability change are split into seperate PR disagg: Add O11y on object store usage summary of each tiflash store #10764 to keep this logical changes clean
  • Added lock-manager metrics to track pre-lock residency and cleanup outcomes (hit/miss/remaining).
  • Added owner-only periodic S3 storage summary in S3GCManagerService.
  • Added per-store S3 summary gauge:
    • tiflash_storage_s3_store_summary_bytes{store_id, type=data_file_bytes|dt_file_bytes}
  • Added setting remote_summary_interval_seconds and wired it through TMTContext; <= 0 disables periodic summary task registration.
  • Updated Grafana panels for the new S3 summary metric.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

# Run chbenchmark workload and check the metrics of `prelock_keys` and OSS usage
tiup bench ch --host 10.2.12.81 -P 8081 --warehouses 8000 run -D chbenchmark8k -T 50 -t 0 --time 30m --ignore-error --queries q1
# Before the fix, from 23:29 to 00:00, the number of prelock_keys in memory would accumulate and increase with the write load; after the fix, from 02:00 to 02:30, there was no longer any persistent residue of prelock_keys in memory.
# Also can check the new added grafana panel "Remote Store Summary (Disagg arch)"

• 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 an issue in disaggregated remote-write paths where pre-lock keys could remain resident under write-group concurrency or partial failure, causing S3GC to retain obsolete objects and inflate remote storage usage. Also add configurable periodic S3 storage summary and per-store summary metrics.

Summary by CodeRabbit

• Bug Fixes

  • Resolved S3 pre-lock key cleanup on write failures to prevent orphaned lock keys.
  • Improved remote write error handling with enhanced exception logging.

• New Features

  • Added S3 lock manager metrics for monitoring lock creation, cleanup, and status.
  • Extended S3 store summary metrics tracking.

• Improvements

  • Enhanced checkpoint operation logging for better visibility.
  • Refined concurrent write batch processing with improved lock key tracking.

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