[sFlow] sFlow agent flow_sample->sequence_number question

[the keralite]

sFlow spec gurus,
If the sFlow agent drops a flow sample export datagram due to lack of
resources then the drops for that data source is incremented. What happens
to the squence_number that is reported in a flow sample? I assume that its
not incremented. OR does the agent increment both the sequence_number and
the drops fields?
TIA
ZC