feat: digest pipeline processor

[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?

A new pipeline processor to digest raw log string and output the log template without variables.

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 5 changed files in this pull request and generated no comments.

[codecov]

Codecov Report

Attention: Patch coverage is 86.24535% with 37 lines in your changes missing coverage. Please review.

Project coverage is 83.91%. Comparing base (bc2f05d) to head (c06a6cd).
Report is 36 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5323      +/-   ##
==========================================
- Coverage   84.15%   83.91%   -0.24%     
==========================================
  Files        1200     1183      -17     
  Lines      225396   221732    -3664     
==========================================
- Hits       189681   186072    -3609     
+ Misses      35715    35660      -55     

[fengjiachun]

LGTM

[shuiyisong]

I don't quite get the usage of this processor, can you give some examples of how to use it or what combinations do it come to help?

[waynexia]

I don't quite get the usage of this processor, can you give some examples of how to use it or what combinations do it come to help?

Extracting templates from logs can help in queries like "what's the top 10 frequent logs in the past 1hr?"

[waynexia]

(bad) Example from loki without this: