/etc/gnuradio/conf.d/gr-audio-alsa.conf is in gnuradio 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | # This file contains system wide configuration data for GNU Radio.
# You may override any setting on a per-user basis by editing
# ~/.gnuradio/config.conf
[audio_alsa]
default_input_device = default
default_output_device = default
period_time = 0.010 # in seconds
nperiods = 4 # total buffering = period_time * nperiods
verbose = false
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