Merge branch 'rails5-mysql-prometheus-alert-spec' into 'master'

Rails 5: fix mysql milliseconds problem in prometheus alert event spec

See merge request gitlab-org/gitlab-ee!7828

ee/changelogs/unreleased/rails5-mysql-prometheus-alert-spec.yml

+---
+title: 'Rails 5: fix mysql milliseconds problem in prometheus alert event spec'
+merge_request: 7828
+author: Jasper Maes
+type: other

ee/spec/models/prometheus_alert_event_spec.rb

@@ -58,7 +58,7 @@ describe PrometheusAlertEvent do
 
           expect(result).to eq(true)
           expect(subject).to be_firing
-          expect(subject.started_at).to eq(started_at)
+          expect(subject.started_at).to be_like_time(started_at)
         end
       end
 
@@ -84,7 +84,7 @@ describe PrometheusAlertEvent do
 
           expect(result).to eq(true)
           expect(subject).to be_resolved
-          expect(subject.ended_at).to eq(ended_at)
+          expect(subject.ended_at).to be_like_time(ended_at)
           expect(subject.payload_key).to be_nil
         end
       end