Fix/4973 json error responses#4977

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mehrdadbn9 wants to merge 5 commits intoprometheus:mainfrom

mehrdadbn9:fix/4973-json-error-responses

Commits on Feb 8, 2026

Fix #4973: Return JSON error responses instead of plain text

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Remove backup files

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Merge branch 'prometheus:main' into fix/4973-json-error-responses
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Commits on Feb 9, 2026

Fix #4973: Return JSON error responses instead of plain text
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Fix #4973: Correct error handling patterns in API handlers
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