From Dash0's structured logging guide, what applies here:
- Each JSON line inside a traced span ends with its trace_id and span_id, so a line in Loki leads
to its trace in Tempo; the access log is written inside its request's span so it has one too.
The JSON formatter takes no extra fields, so WithTrace appends them to the object it writes.
- A feed or download failure carries error.type (the HTTP status, or dns, redirect_loop,
timeout, ...) and http.response.status_code, from failure_kind beside explain_failure, so
failures group by kind without a regex over msg.
- Each event was logged twice: words under ipx::scan and fields under ipx::io. It is now one
line under ipx::scan with both; the wire copy is at debug, for the admin page's Daemon I/O tab,
and out of production's log. The healthcheck's status reply stays under ipx::io.
- The access log's ms is duration_ms. The dashboard and the prod-check skill follow.
- error fields are Display with the anyhow chain everywhere, not a mix of Debug and Display.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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