Flight update response always logs 'missing counts' warning for annotation writes

[dave05]

Description

spans.update_annotations() always emits a WARNING log:

Flight update response missing counts | project='...' request_type='ANNOTATION' total_spans=1 spans_processed=None spans_updated=1 spans_failed=None success_rate=None error_count=0

The annotation writes succeed (spans_updated=1), but spans_processed is None because the Flight gRPC response doesn't populate that field.

Source

arize/spans/client.py line ~1453:

spans_processed = getattr(response, "spans_processed", None)
# ...
if spans_processed is None or spans_updated is None:
    logger.warning("Flight update response missing counts", extra=metrics)

The response object from the server doesn't include spans_processed, so getattr returns None, triggering the warning on every successful write.

Impact

• Every annotation write produces a spurious WARNING log line
• Noisy in production log monitoring (CloudWatch, etc.)
• Annotations are written correctly — this is cosmetic

Environment

• arize SDK: 8.16.0
• Python: 3.13
• Using spans.update_annotations() with single-span DataFrames

Suggestion

Either:

1. Populate spans_processed in the Flight server response for annotation writes, or
2. Downgrade to logger.debug when spans_updated is present and spans_processed is missing (successful write, just missing metadata)