perf: Reduce allocations for JSON and logfmt parser (#18637) #19083
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**What this PR does / why we need it**: The JSON and logfmt parsers suffer from a high number of allocations when the parsed labels have a high cardinality. This change reduces the allocations quite a bit by copying the labels bytes to a byte buffer. Note: The benchmarks ran without a validation step that calls `LabelResult.Labels()` as that method uses a lot of allocation but is used only once in production code.
chaudum
approved these changes
Sep 1, 2025
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What this PR does / why we need it:
Backport of #18637