# ObserverStarting Constructors

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.diagnostics.silolifecycleevents.observerstarting/)

## ObserverStarting(string, int, string, SiloAddress?, ILifecycleObserver) {#constructor-string-int-string-orleans-runtime-siloaddress-nullable-orleans-ilife-9ec7d626}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.diagnostics.silolifecycleevents.observerstarting/constructors/constructor-string-int-string-orleans-runtime-siloaddress-nullable-orleans-ilife-9ec7d626/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Diagnostics/SiloLifecycleEvents.cs#L142-L152)

```csharp
public ObserverStarting(string observerName, int stage, string stageName, SiloAddress? siloAddress, ILifecycleObserver observer)
```

Event payload for when a lifecycle observer is about to start.

### Parameters

- `observerName` (`string`): The observer name.
- `stage` (`int`): The numeric stage identifier.
- `stageName` (`string`): The human-readable stage name.
- `siloAddress` (`SiloAddress?`): The silo address associated with the event, if any.
- `observer` (`ILifecycleObserver`): The lifecycle observer.