Various enhacements to timeseries debugging

[JonathanLennox]

Added during new-BWE experimentation, but independent of it.

[codecov]

Codecov Report

Attention: Patch coverage is 14.49275% with 59 lines in your changes missing coverage. Please review.

Project coverage is 44.25%. Comparing base (ec7d461) to head (90c3b6a).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ansform/node/outgoing/OutgoingStatisticsTracker.kt	0.00%	22 Missing ⚠️
...tsi/videobridge/cc/allocation/BitrateController.kt	0.00%	10 Missing ⚠️
...si/videobridge/cc/allocation/BandwidthAllocator.kt	10.00%	8 Missing and 1 partial ⚠️
...i/nlj/transform/node/outgoing/ProbingDataSender.kt	0.00%	6 Missing ⚠️
.../src/main/kotlin/org/jitsi/nlj/rtcp/NackHandler.kt	0.00%	5 Missing ⚠️
...nsform/src/main/kotlin/org/jitsi/nlj/PacketInfo.kt	75.00%	2 Missing ⚠️
...dge/cc/av1/Av1DDAdaptiveSourceProjectionContext.kt	0.00%	2 Missing ⚠️
...orm/src/main/kotlin/org/jitsi/nlj/RtpSenderImpl.kt	0.00%	1 Missing ⚠️
.../src/main/kotlin/org/jitsi/videobridge/Endpoint.kt	0.00%	1 Missing ⚠️
...c/main/kotlin/org/jitsi/videobridge/relay/Relay.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2321      +/-   ##
============================================
- Coverage     44.32%   44.25%   -0.08%     
- Complexity     2095     2097       +2     
============================================
  Files           351      351              
  Lines         19682    19734      +52     
  Branches       2660     2663       +3     
============================================
+ Hits           8724     8733       +9     
- Misses        10073    10115      +42     
- Partials        885      886       +1     

Files with missing lines	Coverage Δ
...in/org/jitsi/nlj/transform/node/AudioRedHandler.kt	62.57% <100.00%> (+0.44%)	⬆️
...orm/src/main/kotlin/org/jitsi/nlj/RtpSenderImpl.kt	0.00% <0.00%> (ø)
.../src/main/kotlin/org/jitsi/videobridge/Endpoint.kt	23.46% <0.00%> (-0.05%)	⬇️
...c/main/kotlin/org/jitsi/videobridge/relay/Relay.kt	19.15% <0.00%> (-0.04%)	⬇️
...nsform/src/main/kotlin/org/jitsi/nlj/PacketInfo.kt	41.05% <75.00%> (+3.12%)	⬆️
...dge/cc/av1/Av1DDAdaptiveSourceProjectionContext.kt	62.99% <0.00%> (-0.39%)	⬇️
.../src/main/kotlin/org/jitsi/nlj/rtcp/NackHandler.kt	0.00% <0.00%> (ø)
...i/nlj/transform/node/outgoing/ProbingDataSender.kt	0.00% <0.00%> (ø)
...si/videobridge/cc/allocation/BandwidthAllocator.kt	80.68% <10.00%> (-5.24%)	⬇️
...tsi/videobridge/cc/allocation/BitrateController.kt	50.70% <0.00%> (ø)
... and 1 more

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[bgrozev]

We have RTX sent for probing marked as Padding, and plain retransmissions marked as RTX. Suggest renaming RTX -> Retransmission and Padding -> Probing.

[JonathanLennox]

In the new Google CC (which motivated this work), there's separate probing technique (send a short burst of data very fast and measure how quickly it's received) which is different than our padding probing, so I'd like to keep the name "Padding" here. Ok on the RTX.