fix: correct write cache's metric labels

[waynexia]

Signed-off-by: Ruihang Xia [email protected]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?

Several changes are included in this patch.

• Change the behavior of read cache and write cache's configuration. Now user only config for the root dir for cache files. Leave the detailed subdir allocation to DB.
• Change the default path to write cache and read cache. In some cases they are considered breaking.
• Fixes the issue that write cache file's UUID are reported in prometheus layers.

Detailed explanation of path config changes:

From now on, user only config the root file for caches, with default path to data_home. And DB will allocate proper paths for different caches, instead of letting user to care about this. An example local fs dir structure is:

- <data_home>
  - data/<catalog>/<schema>
  - greptimedb/object_cache
    - read
    - write

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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Copilot reviewed 5 out of 8 changed files in this pull request and generated no comments.

Files not reviewed (3)

• src/datanode/src/store.rs: Evaluated as low risk
• src/mito2/src/cache/file_cache.rs: Evaluated as low risk
• src/mito2/src/cache/write_cache.rs: Evaluated as low risk

Comments suppressed due to low confidence (1)

src/mito2/src/config.rs:29

• The warning message is split across two lines, which might cause formatting issues in the log output. It should be a single string.

`inverted_index.intermediate_path` is deprecated, use

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.87%. Comparing base (68dd291) to head (d33dc08).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5227      +/-   ##
==========================================
- Coverage   84.07%   83.87%   -0.20%     
==========================================
  Files        1189     1192       +3     
  Lines      220319   220856     +537     
==========================================
+ Hits       185223   185234      +11     
- Misses      35096    35622     +526     

[killme2008]

LGTM