Set serial_number 0 as deprecated for metrics logging

Bug: 347546280
Flag: EXEMPT 'WW atoms/metrics changes'
Test: Verified with the statsd_testdrive if the sereal_number is set 0 (b/347546280#comment2)


Change-Id: I38eaa9a5cb2790d7b5d02af50b437e881e0fa5ed
1 file changed