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fix(alertmanager): Fix flaky TestMultitenantAlertmanager_InitialSyncFailureWithSharding #7498

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fix(alertmanager): Fix flaky TestMultitenantAlertmanager_InitialSyncFailureWithSharding #7498

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7 changes: 6 additions & 1 deletion pkg/alertmanager/multitenant_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1775,7 +1775,12 @@ func TestMultitenantAlertmanager_InitialSyncFailureWithSharding(t *testing.T) {
err = am.AwaitRunning(ctx)
require.Error(t, err)
require.Equal(t, services.Failed, am.State())
require.False(t, am.ringLifecycler.IsRegistered())

// The lifecycler's background goroutine may briefly re-register the instance
// before the stopping function fully unregisters it. Poll until unregistered.
require.Eventually(t, func() bool {
return !am.ringLifecycler.IsRegistered()
}, 5*time.Second, 100*time.Millisecond)
require.NotNil(t, am.ring)
}

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