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2.1.6-5829

2.1.6-5829: [NA] [BE] Rename attachment input-size metric to bytes (#7257)
@thiagohora thiagohora tagged this 26 Jun 14:33 
* [OPIK-7118] [BE] Rename attachment input-size metric to bytes

Follow-up to #7252. Rename the candidate-field-size histogram to
opik.attachments.input.size.bytes (field inputSizeBytes), both the Java field and
the OTel instrument name. Still recorded as character count, which equals the byte
size for the base64/ASCII payloads this targets and avoids a byte[] copy of the
field — so the dashboard can render it with a byte unit (KiB/MiB). The chars-named
metric never reached a release, so this is a pure rename.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [OPIK-7118] [BE] Record input size as actual UTF-8 bytes

The metric is named .bytes, so record the field's true UTF-8 byte size
(text.getBytes(UTF_8).length) rather than the UTF-16 character count, which
diverges for non-ASCII payloads.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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