Traceloop combines OpenLLMetry with hosted or private observability, but span volume, trace sensitivity, access, and evaluator validity determine fit.
Direct verdict
Traceloop earns a shortlist for OpenTelemetry-oriented teams wanting portable LLM observability. Validate access semantics, redact at instrumentation, calibrate evaluators against humans, and model cost from spans rather than requests.
What to verify
Trace 500 synthetic requests across environments with PII decoys, retrieval, tools, failures, sampling, and two exporters. Measure span multiplication, redaction, isolation, evaluator-human agreement, alert precision, deletion, portability, latency, and cost.