feat(apis): add `LoggingSpec`

[zyy17]

Summary by CodeRabbit

• New Features

  • Introduced a structured logging configuration with options for logging levels and formats.
  • Added logging configurations to multiple components, including frontend, meta, and datanode.
  • Enhanced logging capabilities in GreptimeDBStandalone and GreptimeDBCluster specifications.
  • Implemented a shared volume for logs in Kubernetes Pods, enabling log sharing between containers.

• Bug Fixes

  • Improved handling of logging configurations in various components to ensure proper volume management.

• Documentation

  • Updated API references and documentation to include new logging specifications and configurations.
  • Added examples for configuring logging in the cluster setup.

• Tests

  • Added tests to verify the new logging configurations and their integration within the system.

[coderabbitai[bot]]

Walkthrough

The pull request introduces a comprehensive logging configuration system across various components of the GreptimeDB project. It defines new types and constants for logging levels and formats, establishes a structured LoggingSpec for configuration, and integrates logging settings into multiple specifications and components. Additionally, it modifies deployment logic to accommodate logging configurations, ensuring consistent handling of log data across the system.

Changes

Files	Change Summary
apis/v1alpha1/common.go, apis/v1alpha1/constants.go, apis/v1alpha1/defaulting.go, apis/v1alpha1/greptimedbcluster_types.go, apis/v1alpha1/greptimedbstandalone_types.go	Introduced new logging types, constants, and a LoggingSpec struct, along with getter methods.
apis/v1alpha1/testdata/...	Added logging configurations in various YAML test files for multiple components.
apis/v1alpha1/zz_generated.deepcopy.go	Updated deep copy methods to include the new Logging field in relevant structs.
config/crd/resources/...	Added logging property to multiple resource configurations, defining sub-properties.
controllers/...	Introduced methods to manage logging volumes in pod templates based on logging configurations.
docs/api-references/docs.md	Added documentation for new logging fields and types in component specifications.
pkg/dbconfig/...	Modified various config structs to include LoggingConfig, integrating logging setup.

Poem

🐰 In the land of logs, we now can see,
Levels and formats, as clear as can be!
With paths for our data, both neat and bright,
Our logging's now structured, a true delight!
So hop along, friends, let’s log with glee,
For GreptimeDB shines, as bright as can be! 🌟

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