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Merge pull request #208653 from ggailey777/patch-1
[Functions] Host ID clarify note
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articles/azure-functions/storage-considerations.md

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Functions uses a host ID value as a way to uniquely identify a particular function app in stored artifacts. By default, this ID is auto-generated from the name of the function app, truncated to the first 32 characters. This ID is then used when storing per-app correlation and tracking information in the linked storage account. When you have function apps with names longer than 32 characters and when the first 32 characters are identical, this truncation can result in duplicate host ID values. When two function apps with identical host IDs use the same storage account, you get a host ID collision because stored data can't be uniquely linked to the correct function app.
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>[!NOTE]
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>This same collison can occur between a function app in a production slot and the same function app in a staging slot, when both slots use the same storage account.
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>This same kind of host ID collison can occur between a function app in a production slot and the same function app in a staging slot, when both slots use the same storage account.
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Starting with version 3.x of the Functions runtime, host ID collision is detected and a warning is logged. In version 4.x, an error is logged and the host is stopped, resulting in a hard failure. More details about host ID collision can be found in [this issue](https://github.com/Azure/azure-functions-host/issues/2015).
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