Add documentation for JsonImporter#146

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Phanindra899 wants to merge 7 commits intoapache:masterfrom

Phanindra899:json-importer-docs

Commits on Mar 30, 2026

Commits on Apr 3, 2026

Commits on Apr 4, 2026

Improve JsonImporter docs: clarify timestamp semantics, simplify attributes, fix paths, and update examples
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Commits on Apr 7, 2026

Use realistic multi-point JSON example for change-point detection
Phanindra899
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Commits on Apr 14, 2026

Remove duplicate sample JSON file
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