chore: add more metrics about parquet and cache

[MichaelScofield]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

as title

useful for diagnosing slow queries

Checklist

• [ ] I have written the necessary rustdoc comments.
• [ ] I have added the necessary unit tests and integration tests.
• [ ] This PR requires documentation updates.

Summary by CodeRabbit

• New Features

  • Introduced a cache eviction metric for improved monitoring of cache performance.
  • Added a histogram metric to measure the time taken for loading Parquet metadata.

• Improvements

  • Enhanced observability of cache eviction reasons for better diagnostics.
  • Implemented performance tracking in the MetadataLoader for metadata loading efficiency.

[coderabbitai[bot]]

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Walkthrough

The recent changes improve the caching system's monitoring capabilities by adding metrics for cache evictions and performance tracking during Parquet metadata loading. The CacheManagerBuilder now logs eviction reasons more effectively, while new metrics provide insights into cache behavior and loading efficiency. These enhancements allow developers to better diagnose performance issues, leading to improved overall system observability.

Changes

Files	Change Summary
src/cache.rs	Enhanced CacheManagerBuilder to include CACHE_EVICTION metric for improved logging of eviction causes.
src/mito2/src/metrics.rs	Introduced CACHE_EVICTION counter and PARQUET_METADATA_LOAD_ELAPSED histogram for monitoring cache evictions and metadata loading times.
src/sst/parquet/metadata.rs	Added performance monitoring in MetadataLoader for Parquet metadata loading using the new histogram metric.

Poem

🐇 In the meadow where bunnies play,
Metrics bloom in a lively array.
Evictions tracked with a hop and a cheer,
Loading data faster, the path is now clear!
Cache and metadata, a dance so bright,
Observability shines in the soft moonlight! ✨

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.02%. Comparing base (4cd5ec7) to head (85d6617). Report is 22 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4410   +/-   ##
=======================================
  Coverage   85.02%   85.02%           
=======================================
  Files        1075     1075           
  Lines      192542   192567   +25     
=======================================
+ Hits       163709   163739   +30     
+ Misses      28833    28828    -5     

[MichaelScofield]

@v0y4g3r PTAL

[MichaelScofield]

@evenyag PTAL

[MichaelScofield]

@evenyag PTAL