Log RTT as seen by congestion controller (#3354)

pkg/sfu/bwe/remotebwe/probe_controller.go

@@ -114,6 +114,10 @@ func (p *probeController) UpdateRTT(rtt float64) {
 	}
 }
 
+func (p *probeController) GetRTT() float64 {
+	return p.rtt
+}
+
 func (p *probeController) CanProbe() bool {
 	return p.state == probeControllerStateNone && p.ProbeRegulator.CanProbe()
 }

pkg/sfu/bwe/remotebwe/remote_bwe.go

@@ -316,6 +316,7 @@ func (r *RemoteBWE) ProbeClusterFinalize() (ccutils.ProbeSignal, int64, bool) {
 		"channel", pco,
 		"isSignalValid", pco.HasEnoughEstimateSamples(),
 		"probeClusterInfo", pci,
+		"rtt", r.probeController.GetRTT(),
 	)
 
 	probeSignal := ccutils.ProbeSignalNotCongesting

pkg/sfu/bwe/sendsidebwe/congestion_detector.go

@@ -803,6 +803,7 @@ func (c *congestionDetector) ProbeClusterFinalize() (ccutils.ProbeSignal, int64,
 		"probeClusterInfo", pci,
 		"probePacketGroup", c.probePacketGroup,
 		"congestionState", c.congestionState,
+		"rtt", c.rtt,
 	)
 
 	// if congestion signal changed during probe, defer to that signal