clarify why foreground FCM usage isn't common
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notifications when they're in the foreground. Unfortunately, many apps don't
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implement a service to continue receiving events from their server in the
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background. On the stock OS, they rely on receiving events through Google
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servers via Firebase Cloud Messaging (FCM) in the background, and sometimes
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also in the foreground.</p>
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servers via Firebase Cloud Messaging (FCM) in the background and sometimes
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even in the foreground, although it doesn't have good reliability/latency.</p>
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<p>Polling is the traditional pull-based approach of checking for new events
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at an interval. This is badly suited to mobile devices for anything more than
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