fix: Send client reports for span recorder overflow#5310
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sentrivana merged 3 commits intomasterfrom Jan 14, 2026
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| "buffer_overflow", | ||
| data_category="span", | ||
| quantity=span_recorder_dropped_spans, | ||
| ) |
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Unfinished spans incorrectly reported as buffer overflow
Medium Severity
The _dropped_spans event field contains both spans dropped due to buffer overflow AND unfinished spans (those without a timestamp), but the new code reports all of them with reason "buffer_overflow". In tracing.py, _dropped_spans is calculated as len_diff + self._span_recorder.dropped_spans, where len_diff counts unfinished spans. Only self._span_recorder.dropped_spans represents actual buffer overflow. This causes unfinished spans to be incorrectly categorized in client reports.
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Description
We weren't emitting client reports for spans dropped because they were over the span recorder limit.
Disclaimer: vibe coded but refactored and live tested by hand
Tested 3 times with an app with
max_spans=3and 10 spans in a transactionIssues
Closes #5308
Reminders
tox -e linters.feat:,fix:,ref:,meta:)