Added

• ECN and packet-accounting fields on inbound RTP stats: packetsReceivedWithEct1, packetsReceivedWithCe, packetsReportedAsLost, packetsReportedAsLostButRecovered.
• packetsWithBleachedEct1Marking to outbound RTP stats.
• encodingIndex to outbound RTP stats.
• psnrSum and psnrMeasurements (new PsnrSum record with y, u, v components) for video quality measurement.
• frozen state to IceCandidatePairStats.

Changed

• qualityLimitationDurations restructured into a named QualityLimitationDurations record with none, cpu, bandwidth and other fields.
• Node 22 across the CI workflows.
• Protobuf handling reworked and dependencies updated; CONTRIBUTING.md added.

Source: ObserveRTC schema changelog. Date follows the changelog’s schema-version date, rather than a GitHub release publication date.