function app

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multiple instances:
https://docs.microsoft.com/en-us/azure/app-service/webjobs-sdk-how-to#multiple-instances

timer trigger =>

https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-timer#scale-out

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to get website instance id => https://stackoverflow.com/questions/46116581/how-to-retrieve-instanceid-process-id-of-a-running-azure-webjob-using-c-sharp

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function async 👍 https://stackoverflow.com/questions/29625813/how-to-make-azure-webjob-run-continuously-and-call-the-public-static-function-wi

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webjob sdk usage: https://docs.microsoft.com/en-us/azure/app-service/webjobs-sdk-how-to

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🏎 https://github.com/Azure/azure-webjobs-sdk/blob/dev/src/Microsoft.Azure.WebJobs.Host/Indexers/FunctionIndexProvider.cs