Compare two Grafana Pyroscope profiles by diffing their flamegraphs via the API
domain: grafana.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Identify the two time ranges and label selectors (service, profile type) you want to compare
Call the Pyroscope querier's Diff RPC endpoint with `left` and `right` profile selectors, each specifying `start`/`end` and a `labelSelector`
Set the desired output format (e.g. flamegraph) in the request
Send the request and parse the returned diff data, which highlights regressions and improvements between the two ranges
Cross-check results against the Pyroscope UI's built-in comparison/diff view for validation
Automate recurring diffs (e.g. before/after a deploy) by scripting calls to this endpoint instead of using the UI manually
Known gotchas
The legacy single-range render endpoint does not support diffing — diff functionality is only available through the newer query API, not the older REST render path
Diff quality depends on both ranges having comparable traffic/sample volume; sparse profiles produce noisy diffs
Label selectors must match closely between the two sides or the comparison won't be meaningful
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