[pkg-go] Bug#830936: prometheus-alertmanager: FTBFS on arm64: dispatch_test.go:132: received batch to[o] early

[Aaron M. Ucko]

Source: prometheus-alertmanager
Version: 0.3.0+ds-1
Severity: important
Justification: fails to build from source

The arm64 build of prometheus-alertmanager failed:

  === RUN   TestAggrGroup
  --- FAIL: TestAggrGroup (1.30s)
  	dispatch_test.go:132: received batch to early after 299.982ms
  === RUN   TestInhibitRuleHasEqual
  --- PASS: TestInhibitRuleHasEqual (0.00s)
  === RUN   TestInhibitRuleGC
  --- PASS: TestInhibitRuleGC (0.00s)
  === RUN   TestRouteMatch
  --- PASS: TestRouteMatch (0.00s)
  FAIL
  FAIL	github.com/prometheus/alertmanager	1.314s

Could you please take a look?

Thanks!