option to setup ProcessStartupTimeout

[IsharaPannila]

Description

I got an issue recently with function app start due to ProcessStartupTimeout is 60 seconds.
we got lot of dependencies and key vaults with lot of secrets which make our function startup to go beyond 60 seconds. It would be better if we can get startup time configurable at least when function app run in container environment.

[IsharaPannila]

things i tried and didn't work.

1. add below code to start
   .ConfigureHostOptions(options =>
   {
   //no use, hopefully oneday MS will make this work
   options.StartupTimeout = TimeSpan.FromMinutes(5);
   })

2)add workerconfig.json with below values

"CountOptions": {
"ProcessStartupTimeout": "00:03:00"
}
}

[IsharaPannila]

this is the error when starting

  Handling WorkerErrorEvent for runtime:dotnet-isolated, workerId:dotnet-isolated. Failed with: System.TimeoutException: The operation has timed out.

2025-05-17T11:34:15+10:00 at Microsoft.Azure.WebJobs.Script.Grpc.GrpcWorkerChannel.PendingItem.OnTimeout() in /_/src/WebJobs.Script.Grpc/Channel/GrpcWorkerChannel.cs:line 1797

[kshyju]

This functionality is currently not supported. The timeout value cannot be set within your function app's startup code, as it is required before the function app begins execution. To enable this capability, we would need to update the host to read the setting from the app configuration and apply it to worker.config. We’re considering this as a potential future enhancement, but there is no ETA at this time.