feat(biz): Added the value length limit function for AppId-level configuration items

[youngzil]

What's the purpose of this PR

• Added the appid.value.length.limit.override configuration to control the value length limit at the AppId level
• Modified the namespace.value.length.limit.override configuration to override the AppId-level limit
• Updated the length limit check logic in ItemService to support limits at both the AppId and Namespace levels
• Added test cases for new features in unit tests

Which issue(s) this PR fixes:

Fixes #5254

Brief changelog

XXXXX

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• [ ] Read the Contributing Guide before making this pull request.
• [ ] Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
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• [ ] Run mvn clean test to make sure this pull request doesn't break anything.
• [ ] Update the CHANGES log.

Summary by CodeRabbit

Release Notes for Apollo Version 2.4.0

• New Features

  • Introduced value length limit function for AppId-level configuration items.
  • Enhanced global search capabilities for administrators.
  • Added caching record stats function for improved performance.
  • Support for dynamic configuration of the refresh interval for admin server addresses.
  • Detailed configuration options for limiting the length of keys and values based on app IDs and namespaces.

• Bug Fixes

  • Resolved issues with duplicate comments and blank lines in configuration management.
  • Fixed missing items in the published namespace link.

• Documentation

  • Updated distributed deployment guide with detailed instructions for configuration and deployment processes, including Docker and Kubernetes setups.

[coderabbitai[bot]]

Walkthrough

The changes introduced in this pull request encompass enhancements to the Apollo Configuration Center, including the addition of a value length limit function for AppId-level configuration items. Updates include improved server configuration links, REST template client connection pooling, and global search capabilities for administrators. Several fixes address issues with duplicate comments and blank lines. The modifications also enhance the BizConfig and ItemService classes to better manage namespace and AppId configurations, alongside updates to documentation for clearer deployment instructions.

Changes

File	Change Summary
CHANGES.md	Added entry for new feature on value length limit for AppId-level configurations, updated server configuration links, and documented several fixes and enhancements.
apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/config/BizConfig.java	Added methods for AppId and namespace value length limit overrides, removed an existing method for namespace limits, and introduced a static type reference for deserialization.
apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ItemService.java	Updated methods to use Namespace objects instead of long IDs for item value length checks, enhancing clarity and efficiency.
apollo-biz/src/test/java/com/ctrip/framework/apollo/biz/config/BizConfigTest.java	Added new test for appIdValueLengthLimitOverride method, including various input scenarios and error handling.
apollo-biz/src/test/java/com/ctrip/framework/apollo/biz/service/ItemServiceTest.java	Enhanced test setup with additional dependencies, modified existing tests, and added new tests for item saving with value length limit overrides.
docs/en/deployment/distributed-deployment-guide.md	Updated deployment guide with detailed configuration instructions, including MySQL version requirements and Docker/Kubernetes deployment examples.
docs/zh/deployment/distributed-deployment-guide.md	Similar updates to the Chinese version of the deployment guide, enhancing clarity and detail on deployment processes and configurations.

Assessment against linked issues

Objective	Addressed	Explanation
Provide AppId-level parameter to skip value length checks (#5254)	✅
Enhance configuration management for value length limits (#5254)	✅

Possibly related PRs

• #5264: This PR is directly related as it introduces a feature that implements a value length limit function for AppId-level configuration items, which is mentioned in the main PR summary.
• #5228: This PR adds a limit and whitelist for the namespace count per AppId and cluster, which aligns with the main PR's updates regarding limits on namespace counts.
• #5240: This PR addresses the issue of missing items in the published namespace link, which is also noted in the main PR's summary of fixes.
• #5248: This PR enhances the RefreshAdminServerAddressTask to support dynamic configuration of the time interval, which is a feature highlighted in the main PR.
• #5263: This PR refactors the database schema to align the lengths of the ClusterName and NamespaceName fields, which is mentioned as a significant change in the main PR summary.

Suggested labels

lgtm

Suggested reviewers

• nobodyiam

Poem

🐇 In the garden where configs grow,
Length limits now set to flow.
AppId whispers, "Let me be free,"
With namespaces dancing in harmony.
Updates and fixes, all in a row,
Apollo's magic, watch it glow! 🌟

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