docs: prioritize Loki protocol for Grafana integration with Databend Cloud

[everpcpc]

Summary

Reorganized the Grafana integration documentation to prioritize the Loki protocol compatibility interface for Databend Cloud users.

Changes

• Prioritized Loki Protocol: Made it the primary recommended method for Databend Cloud integration
• Added Table Schema Examples: Included two recommended schema types (Loki schema and Flat schema) with inverted index examples
• Updated Configuration Steps: Restructured into clear sections - Configure Table, Get Connection Information, Configure Grafana Data Source, Test Queries
• Added Required HTTP Headers: Documented the three essential custom headers (X-Databend-Warehouse, X-Databend-Database, X-Databend-Table)
• Added Screenshots: Included 7 new screenshots showing the complete configuration workflow
• Moved Custom Plugin: Repositioned as an alternative approach for advanced use cases or self-hosted Databend
• Added Feature Activation Note: Documented that Loki protocol requires contacting support to enable

Testing

Documentation has been reviewed for accuracy and completeness of the Loki protocol integration steps.

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Jan 22, 2026 6:16am

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