alert count shows up as 0 when stats are disabled
Needs backport to 5.0, Needs backport to 6.0
nfs3-01 s-v test (w Suri master) on cmdline:
 21/6/2021 -- 23:44:44 - (counters.c:854) <Info> (StatsLogSummary) -- Alerts: 0
but there are 22 alerts in eve.json and the test passes.