If your Google webRTC cannot find your microphone (and you check with firefox and notice it is using the output monitor as a microphone, then the pactl default source is set incorrectly. How on earth this happened after an auto-update I do not know. Needless to say I have disabled auto-updates.

examine your sources

sudo pactl list short sources
0	alsa_output.pci-0000_00_1f.3.analog-stereo.monitor	module-alsa-card.c	s16le 2ch 44100Hz	IDLE
1	alsa_input.pci-0000_00_1f.3.analog-stereo	module-alsa-card.c	s16le 2ch 44100Hz	SUSPENDED

fix your default sources and sinks

sudo pactl set-default-source 'alsa_input.pci-0000_00_1f.3.analog-stereo'

WebRTC trouble-shooting

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