Snapshot Listeners 是否有限制或费用?

Is there a limit or cost for Snapshot Listeners?

最近 updates to Firebase,Cloud Firestore 引入了 两个新的 使用指标

关于活动连接,我发现有一个limit of 1000000 (1M) concurrent connections. So I can understand why that metric would be useful, but what about the snapshot listeners metrics? That number looks quite scary and Stackdriver Monitoring没有提到任何成本 限制 为 "The number of snapshot listeners across all active connections".

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