docs: add rc2 release note

[WenyXu]

What's Changed in this PR

as title

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the comprehensive release notes for GreptimeDB v1.0.0-rc.2, detailing significant performance enhancements, new features, and critical bug fixes. It also updates the previous release note to recommend upgrading to this new release candidate. The primary focus of v1.0.0-rc.2 is on improving query performance through dynamic filtering and optimizing data ingestion and scanning processes, alongside general stability improvements.

Highlights

• Dynamic Filter for TopK and Scan Pruning: Introduced dynamic filter pushdown into region scans, significantly improving TopK query performance (e.g., from ~28.86s to ~0.21s on non-indexed timestamps) and strengthening pruning effectiveness through runtime filters and shared partition pruners.
• Broader Performance Optimizations Across Ingest and Query: Implemented multiple performance updates for Prometheus ingest and Mito query scan paths, including optimized Prometheus decode and remote-write decode, and accelerated Mito2 Parquet scans via min-max caches.

Changelog

• blog/release-1-0-0-rc-1.md
  • Added a recommendation to upgrade to v1.0.0-rc.2.
• blog/release-1-0-0-rc-2.md
  • Added new release notes for v1.0.0-rc.2.
  • Included important bug fixes for repartition, such as rejecting writes to deallocating regions during region merge and ensuring the staging phase waits for compaction to complete.
  • Detailed new features like dynamic filter for TopK, support for group by operations in PromQL, Prometheus 3.x behavior adaptation, and various COPY command enhancements for JSON, GCS, and Azblob.
  • Listed numerous bug fixes addressing issues in PromQL plans, meta-srv client handling, Mito2 filter extension ranges, TQL explain results, and primary key index order preservation.
  • Documented refactorings for vector index metadata, table metadata structures, partition rule versioning, and remote write code.
  • Updated project status and added new documentation links for o11y 2.0 and .NET ingester SDK.
  • Highlighted performance improvements in Prometheus decode, remote-write decode, and Mito2 Parquet scan via min-max caches.
  • Added new tests for vector index and repartition fuzzing, along with fixes for unstable index meta list tests.
  • Included miscellaneous tasks such as dependency updates (e.g., DataFusion, Arrow), CI improvements for monitoring and tracing, and removal of deprecated dependencies.

Activity

• WenyXu created this pull request to add the release note for v1.0.0-rc.2.
• The pull request includes a checklist for confirming document revisions, sidebars.ts consistency, and follow-up updates in localized documentation.

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[gemini-code-assist]

Code Review

This pull request adds the release notes for v1.0.0-rc.2. The changes are mostly good, but I've found a couple of minor issues that could improve the quality of the documentation. I've suggested expanding a truncated pull request title for clarity and sorting the list of contributors for better readability and consistency. Please see my detailed comments.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[killme2008]

LGTM

[fengjiachun]

LGTM