Update sig-scalability/slos/dns_programming_latency.md

Co-authored-by: Tim Hockin <thockin@google.com>

Author: aojea

sig-scalability/slos/dns_programming_latency.md

@@ -39,7 +39,10 @@ The reason for doing it this way is feasibility for efficiently computing that:
     in 99% of programmers (e.g. iptables). That requires tracking metrics on
     per-change base (which we can't do efficiently).
 
-- The SLI is expected to remain constant independently of the number of records, per
+- The SLI for DNS publishing should remain constant independent of the number of records.  For 
+- example, in a headless service with thousands of pods the time between the pod being assigned an IP and 
+- the time DNS makes that IP availabe in the service's A/AAAA record(s) should be statisitically consistent for the 
+- first Pod and the last Pod.
 example, in a headless service with thousands of pods the SLI for the first and the
 last Pod should not exhibit a statistically significant difference.