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Lightstep

Lightstep is a distributed-tracing / observability SaaS (acquired by ServiceNow in 2021). It exposes "streams" — saved queries over trace data that downstream dashboards subscribe to — which can be panelled alongside metric panels in Grafana for side-by-side comparison.

Stub page created for cross-referencing from sources/2023-11-19-zalando-migrating-from-elasticsearch-7-to-8; Lightstep's full architecture is not covered here.

Seen in

• sources/2023-11-19-zalando-migrating-from-elasticsearch-7-to-8 — Zalando built their ES 7→8 Blue/Green migration monitoring on Lightstep streams + Grafana dashboards to compare the old and new clusters side-by-side per endpoint: latency, error rate, CPU, memory, and — crucially for data-sync verification — index sizes and per-cluster deltas. Data-sync convergence (snapshot restore + shadow intake + stream reset) was verified by watching the index-size delta shrink to zero over the shadow window.