Prevent incorrect alert triggering

Alerts were being incorrectly triggered in pulled value metrics because
a diffed value is always assumed to be over one bucket interval, which
may not be true when multiple buckets are skipped.

Bug: 159390273
Test: atest statsd_test
Change-Id: Iada3df54ebb30353572a14e0db86bed49c5515b0
3 files changed
tree: 4a11dd2a7aeaa86a620dd51034aa14f6db9003d2
  1. bin/